This application displays drawing techniques
The purpose of technical drawings is so that you can clearly and accurately capture all the geometric features of a product or component so that you can more accurately determine the image that you will design.

With this you can also describe the process of making items, which you can use to convey technical ideas during the design process,

The categories in this picture include
1.Drawing Engineering
2. Drawing Engineering Technique
3. Engineering drawing Mechanical

And there are many more that you can find in this application about Engineering drawing,
Hopefully this application is useful for you
Thanks.