What is the patent? Is it true that only patents made by scientists can apply for patents? Is it a patent for me to transform an old farm tool here?

Anyone can apply for a patent, there is no restriction.

As long as there is nothing or something innovative in the world, it is possible to get patent protection. Patents are divided into two categories, invention patents and utility model patents.

You need to pay a fee to apply for patent protection, and only when you apply for a patent will you get benefits.