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Form I: Shii-Cho "Way of the Sarlacc" or "Determination Form"

Form I is the most basic of the seven forms and is learned by every Jedi Youngling. Shii-Cho includes the fundamental elements of all the lightsaber forms including the basic attack, parry, body target zones, and practice drills called velocities.

Form I, like its succeeding forms, included the following basic techniques and concepts:
attack, a set of attacks aimed at different body zones
parry, a set of blocks to thwart any attack in the specified body zones
body target zones (1 - head, 2 - right arm and side, 3 - left arm and side, 4 - back, 5 - right leg, 6 - left leg)[14]
training drills called velocities

Shii-Cho philosophy emphasized victory without injury and as such, the sun djem mark of contact was traditionally employed by Form I Practitioners. Keeping with the use of sun djem, one of the attacks utilized by Form I practitioners was referred to as the "Disarming Slash". This attack consisted of a strike directed towards the opponent's weapon with the intent to rip it out of their grasp. Another of the techniques utilized by Shii-Cho was dubbed the "Sarlacc Sweep", a wide sweeping attack in which the duelist strikes out against multiple enemies.

Form I was said to allow focus and a slightly improved chance of connecting with the opponent. Because the ancient Jedi did not have lightsaber-wielding enemies, Form I was not developed with lightsaber-to-lightsaber combat in mind. Nonetheless, because of its few advantages and disadvantages, Shii-Cho was an effective form to fall back on when no other form would do to suit the current combat situation.

Form III: Soresu "Way of the Mynock" or "Resilience Form"

Form III was first developed in response to the advancement of blaster technology in the galaxy. Soresu's emphasis on tight, efficient movements that expose very minimal target areas, make it the most defensive and passive of the seven forms.

Soresu utilized motions that occurred very close to the body, in an attempt to achieve near-total protection and expend as little energy as possible while executing moves. Form III stressed quick reflexes and fast positional transition, in order to overcome the rapidity with which a blaster could be fired. This technique minimized the body's exposure, making a well-trained practitioner nearly invincible. Followers of Soresu preferred to remain on the defensive until their opponent left an opening that a Soresu practitioner could exploit.
Observers generally described Soresu as a passive form of combat. Jedi with extreme patience and reserved personality often employed the form - in fact, during the Clone Wars, Soresu was the most commonly used lightsaber form in the Jedi Order.

Soresu Opening Stance- The opening stance placed the dominant leg backwards in conjunction with the supporting arm which holds the blade horizontally parallel to the temple while the opposing arm is held forward in challenge.

Circle of Shelter- A technique where the duelist creates a protected area around themselves and their allies, making it difficult for enemies to penetrate.

Deflecting Slash- A technique where the duelist takes the momentum of deflecting an enemy projectile and redirects it towards an adjacent target.

Form III involved preparation for prolonged battles where the user observed and learned as much as possible about their opponent's or opponents' technique while engaged in combat. Also, by being more capable in lengthy battles, a Soresu user had the ability to gain control of a combat situation, creating multiple options for the Jedi employing the form. A Form III user could choose to kill, disarm, or even reason with their opponent.

The defense and control of Soresu allowed a practitioner made for suitable outcomes in favor of the user when faced with hurried opponents who left themselves vulnerable to counterattack. However, its defense required a very large amount of focus from the wielder and even a momentary fault in concentration could spell defeat. Jedi with less focused minds would usually abandon this style of combat to capitalize on the benefits of other styles that required less dedication to prolonged fighting. Form III utilized strikes and blocks with the lightsaber at very fast speeds with the blade extremely close to the wielder's body. This form also utilized some acrobatics such as those seen in Form IV to make the wielder even harder to catch.
Form lll was effective against single powerful enemies, as well as large battles with multiple enemies. Form lll was also the most effective form for deflecting blaster bolts, since it was originally designed to combat blaster-wielding opponents, and since the movements are very swift and close to the body, there would basically be no open space between attacks that could leave the wielder open to blaster fire. Jedi who mastered Soresu were known to have an unbreakable defense, and the most successful when dealing in situations when a quick victory was not as favorable as total understanding and calculated action. Soresu users will only attack the enemy to deliver the disarming strike (unless fighting against battle droids), and will keep defending until they see an opening in the enemy. Soresu masters had an unbreakable defense, as mentioned above, and could trap opponents in their own attacks

Form V: Shien / Djem So "Way of the Krayt Dragon" or "Perseverance Form"

Form V was also created in response to the advancement and frequency of blaster use in the galaxy. Unlike the strictly defensive style Soresu, Shien exploits the ability of a lightsaber to block blaster bolts and deflect them back at an opponent in a counter-attack maneuver.

Form V was created by Form III masters who preferred a more offensive style, since the defensive nature of Form III could lead to prolonged combat. It evolved into an accepted style by combining the defensive maneuvers of Form III with the more aggressive philosophy and tactics of Form II. Form V also required a higher level of physical strength than the other lightsaber forms, due to its focus on complete domination of opponents.

Shien

To the Jedi of the ancient Republic who developed and employed the classical Form V, Shien, the form was known as the Perseverance Form. Shien was described as being well adapted to guarding against blaster fire and enemy strikes without compromising one's ability to launch powerful counterattacks, though was less effective against a single opponent. Shien was known to have existed at least as early as the Jedi Civil War. With its focus against blaster fire, Shien kept in mind that Jedi were often outnumbered by their opponents and needed to defend themselves while retaining offensive capability.
Additionally, there was an ancient Sith variant of this classic lightsaber form called Sith Shien. Sith Shien was known to focus on quick and aggressive attacks against the user's opponent.

The Shien opening stance was a high guard position, with the hilt held in a two-handed grip above the user's head, and the blade angled upwards and behind the user. The dominant leg would be back, enabling powerful step-through strikes to be utilized. Another Shien position consisted of an unorthodox horizontal attack stance which was used to perform long, sweeping strikes to take down several enemies at a time. Shien users were also proficient in a maneuver referred to as the "Barrier of Blades", which defended the user from blasterfire and redirected some of the incoming blasts. "Shien Deflection" was another technique familiar to users of that Form V variant, allowing practitioners to simultaneously deflect weapons fire and leap towards an opponent.


Djem So

Djem So was the creation of a group of Form III masters who felt that Soresu was too passive. It addressed the shortcomings of Form III, in which a Jedi Master may have proved to be unbeatable but was likewise unable to overcome a skilled opponent. Utilizing a combination of blocks and parries, a Djem So user maintained a proper foundation in terms of defense against both ranged and melee attacks. While a Soresu user stayed on the defensive, however, and only counterattacked when necessary or when an opening appeared in his opponent's defense, a Djem So practitioner was not nearly so passive. Immediately after defending against an opponent's strike, a Djem So stylist would follow with an attack of their own, bringing the force of the opponent's own blow against them and seeking to dominate the duel. Djem So placed a heavy focus on brute strength and pure power, with wide, powerful strikes and parries followed immediately by counterattack.

The Djem So attack stance consisted of holding the lightsaber above the head, angled back and down at an approximately forty-five degree angle. The characteristic Djem So attack was dubbed the "Falling Avalance", an overhand power blow that crashed down upon an opponent with incredible force. Djem So users also employed a tactic known as the "Fluid Riposte", which involved a smooth transition from parrying an attack to a counterstrike.

Form VII: Juyo "Way of the Vornskr" or "Ferocity Form"

Form VII seeks also to incorporate a type of balance between forms I through V, but unlike Form VI its purpose is not to blend them in harmony. Juyo instead employs bold, direct movements, more open and kinetic than form V, but not so elaborate as the acrobatic form Ataru. Juyo requires greater energy and intensity out of the practitioner because his focus is wielded more broadly and draw upon from a deeper well of emotion; while the outward bearing of a Form VII practitioner is one of calm, the inner pressure verges on explosive. It was also considered to be the most dangerous in regard to falling to the Dark Side, because it required a certain amount of enjoyment in the fight from the person experiencing it.

A Form VII practitioner was said to maintain a calm exterior appearance, but they were also stated to experience significant internal pressure, while using the Ferocity Form. In addition, it was described as sometimes paradoxical and unpredictable, as well as filled with concepts that made the form too difficult and unattractive to many students.

Juyo was described as the most vicious form of lightsaber combat, and was said to be filled with both fury and "malignant grace." The form was given the title of the most difficult and demanding form in all of saber combat.

Known moves and maneuvers

Juyo users were proficient in a technique called Assured Strike, wherein they traded sheer power for a near-certainty of landing a hit. Another technique they used was referred to as Vornskr's Ferocity, which involved "ferocious" attacking of an opponent. Wielders of Juyo were capable of employing this move without allowing the influence of the dark side to pervade their aggression.[5]

(Note: Vaapad was made by Mace Windu and Sora Bulq, and they were the sole masters of it, and both died in the clone wars with no successors, and therefore is a dead form)
(Note2: Most text was taken from wookiepedia)