Can I create a grid like in illustrator to work on drawing letters?
Experiment with file > font info > other settings > grid step and subdivision. A precise explanation is in the handbook.
I draw a grid glyph as very thin rectangles, set it to not export, and then place a component of the grid glyph in the background layer of whatever glyph I’m drawing. This way I can align strokes with the grid regardless of glyph spacing. This works well with coarse grids (which is what I use when I sketch on paper) but it’s not good for fine grids.