a question on painting ¿?

[raaaid]

i like painting but it takes me lot of try and wrong before getting it right, i think im better with clay than with paints cause of this

is there any easy paintings where if i put too much blcak i can correct it with white and then if i put too much white can correct it again with black and so on...?

doesnt work with watercolour

i know with oil you can do this but well oil its expensive and difficult

any advice?