Can an idea be patented? How to apply?

Strictly speaking, a relatively novel idea can be patented, and its prerequisite is 1, which is mature and feasible, can be implemented literally, is practical, can bring economic benefits, is advanced, can save costs and bring greater value compared with the prior art, and has never applied for a similar patent before. If all the above points are met, you can apply for a patent, you can write your own manuscript and submit it to the patent office, or you can ask an agency for help.