Find the right direction to learn cad. What's the use of learning cad? Or what kind of work can you do? Orientation according to personal needs. For example, if you are an employee in the whole house customization industry, it is very easy to learn cad.
You don't need to learn cad drawing of buildings, you just need to master the basic operation of cad software and know the material properties, plate structure and customized dimensions of the whole house. Normal people can try to draw independently in about three days after learning cad whole house customization, even if it is slower, at most ten days.
If you can't feel the heat for ten days, you should find your own reason, not IQ, but learning methods. Don't rely too much on teaching materials in learning, and I don't suggest that you rely too much on teaching materials. If you rely too much on book tutorials in learning cad, you are all wet. You can't learn a simple thing for three to five months or even a year.
If the function of the software is to be compiled into a book, it will be thicker than the four classic novels, just like driving test. One-inch-thick books on driving knowledge and traffic rules can't be read, but people who can drive can just hit the steering wheel, brake and refuel.
The same is true of learning cad. Cad software is just a tool. Why make the study so grand? Real principals become principals under relaxed but conscious habits or conditions; Real singers also present perfect songs under relaxed and comfortable conditions.