the purpose of technical drawing is to let the viewers know what your drawing is all about!
Search Google
There are many sites available that offer online drawing. These drawing sites include, but are not limited to, Autocad online, Google Sketch-up, and Google Draw.
it produces music...
because it is fun
to generate a topic
because it is fun
For Shading your drawing
google transalate
The answer depends on the purpose. For example, the accuracy required from an engineering drawing is much greater than a child's drawing of his house.
The purpose of writing or drawing a political cartoon.
Try google