How do you draw in multiple colors with grease pencil? Im trying to draw in color, but all my strokes come out the same grey color, no matter if I use material or vertex color.

I have also seen related questions or tutorials where the way they change the color is by either changing the material of a stroke manually or using the tint tool (not that I got those to work either) and what I want is for the stroke to act like strokes in a drawing program, being drawn in the color selected directly and all.
How would you do that?
First, make sure that you are in material preview shading or rendered shading (unfortunately you cut the top of the viewport on the image on the question, don't do that).

Color will not appear in solid view.


For Material.
Set the material for the stroke and fill in the material properties window.


For vertex color
Set the color directly either on the top color selector on the screen.

Or use the tool options in the properties window.