2. If you entrust or cooperate in R&D, you need to sign a contract in advance to clarify the ownership of the patent right, otherwise the patent application right will be owned by the person who actually makes technical contributions by default.
Patent right is an intangible asset and a monopoly right, which can prohibit others from manufacturing, promising to sell, selling, using and importing patented products without permission. However, patented products are not necessarily produced by themselves, and can be transferred or licensed to people who have the ability to earn transfer fees or licensing fees. If conditions permit, you can also connive at others' imitation first, and then sue him for infringement after he opens the market to earn tort compensation. It's called fattening before killing. But this move needs good evidence. Therefore, don't give up the patent right easily.
There is no answer to what technology is involved. You can cooperate with enterprises or universities, but enterprises or universities are generally cunning. Find reliable friends or some students, technicians and the like.