If you mean a serious learning for trampolining you should be very careful in choosing trampoline.
For serious learning you would need the professional type of trampoline, which is used in competitive sports. Professional trampolines have a webbed surface and are set up indoors or on a very stable flat area outside. It should be covered after use to prevent weather damage. This type of trampoline has absolutely different bounce characteristics to traditional types.
Professional trampolines and accessories include professional competition Gymnastic Olympic trampolines, training spotting rigs, twisting belts, and professional mini trampolines for trick trampoline performers.
Professional trampolines are more durable and not recommended for regular use. This type of trampoline is used by athletes and coaches.
The frame of professional trampolines is made of steel.
Professional trampolines are usually rectangular and about 14 feet by 7 feet.
Professional trampolines are made of extremely durable fabric.