Not commenting enough, using if instead of switch, messing (and breaking) the IDE, not reading pop up messages, thinking and not doing, watching Netflix, starting on new projects before finishing old ones, complaining about certain languages, googling instead of figuring it for myself (sometimes), let my friends persuade me into making something for them, run-on sentences, not enough comments, giving up quickly, not doing adequate research, and of course, not writing down good ideas I have.