You can also study openings with a coach, it makes it a lot easier and a lot more fun.
I can tell you that if you do not care about your openings you will not be able to cross high ranks since middle and endgame revolve around the chosen openings as there are things like specific pawn structures and weaknesses and of course main ideas.
Im wondering what a beginner should focus to study. Im rated 2200 in Tactics but only 1200 in blitz and rapid gameplay. According to some members, the average difference between tactics and game rating is aprox. 600, so I should be 1400-1800 rating at least based on this, but that is not the case.
I really dont like studying openings, and now Im starting to think that might be my main weakness right now, but many defend that openings are not important until 1800 rating.