Question

How to save a drawing in a computer

Answer 1

On your computer, go to Google Keep.At the top, click New note with drawing​​ .To start drawing, click and drag in the drawing area.To save the drawing, click Back  .In the bottom right, click Done.

To edit your drawing, open the note and click the drawing.

Answer 2

I hope you are drawing in Ms paint
go to file
go to "save as"
set a location and save