For participant safety and to ensure proper technique is developed, Judo should only be practiced under the supervision of a qualified instructor.
Osaekomi waza (pinning techniques) are used to control your opponents to keep them from being able to attack you, while still allowing you to escape if you need to.
Kesa gatame - Scarf hold
Kata gatame - Shoulder hold
Tate shiho gatame - Front four corner hold
Yoko shiho gatame - Side four corner hold
Kuzure kami shiho gatame - Modified upper four corner hold
Kami shiho gatame - Upper four corner hold
Ushiro kesa gatame - Reverse scarf hold
Kuzure kesa gatame - Modified scarf hold
Ura gatame - Back hold
Uki gatame - Floating Hold