There should be a set of 1 mechanical design manuals, which should be read frequently. It is recommended to use the chemical industry press, which is easy to understand and practical, while the mechanical industry press is too professional and not practical.

Contact the manufacturer of standard parts, and it is best to get the selection samples of each standard part, such as cylinders, motors, reducers, various bearings, linear guides, ball screws, manipulators, linear modules, etc. Not to list them one by one, but to understand the purpose of each standard part, we will know what structure to choose in design.

Find a technical forum for mechanical specialty, which is full of technical discussions, where you can watch, learn and communicate. I registered for the 3D Network Technology Forum.

Know the knowledge of machining and assembly, otherwise you will only design concepts, not machining and assembly.

Ask the seniors around you more, and be responsive. You can't be discouraged by others' bad attitude towards you. Be sure to have a good attitude and a thick skin.

There is another point that I almost forgot. I must be familiar with materials, various materials, metals and nonmetals, as well as their properties, heat treatment processes and surface treatment processes.

Isn't it a little scary to see so much? Ha ha. But no one can eat a fat man and learn where to use it while using it. Nothing is difficult for those who are willing to try. Besides, the network is so developed now that all the above knowledge can be found online, but I suggest that it is more convenient to prepare paper documents. Come on, my friend. We work together.