you can leave comments in your code like
// TODO: fix the blah blah whatever etc
but i don't recommend it. one of the issues is that every time you write one, you have to think of something to put after the 'TODO:' part which breaks your flow. instead i recommend writing something like these:
// ugh!!!!!
// FOUL
// Disgusting
// im going to be sick
@jk if i had a penny for each time i've commented my own code with "this is bad!!” or "wrong way to do this" i could retire