Im gonna give y'all a quick pixelartmaker.com tutorial to help y'all out!
Real quick I recommend having your screen zoomed out as far as you can, that way you can more easily see the full drawing, and save it much easier as well, and you can manually zoom in how you would on any other website, just doing the two fingers on mousepad zoom in.
Here's your tools
Top one does idk, i think it hides your tools but I would not recommend doing that!
Next one is a your basic "copy and move" tool (no hot key)
3rd is the pencil tool (hot key is p)
4th is straight line tool (hot key is l)
5th is paint bucket (hot key is f)
6th is eraser tool (hot key is e)
7th s color changer, you manually go thru the colors and shades (no hot key)
8th is your basic color picker, if you click on an already existing color with it, then you get that color (hot key is o)
9th is saving images (no hot key)
10th is a tool that changes how the grid looks, (no hot key)
I prefer this option where is shows the little dot backdrop and has the colors completely solid, no borders.
11th clears entire canvas, but if you want to just quickly get rid of certain areas, using the copy tool can be used to highlight over parts of drawings, and pressing backspace deletes the drawings in that spot, neat huh? (no hot key)
12th I assume undos? I just use ctrl + z