The way I approach this, is I follow my opening if it's sound to do so. If my opponent pops off an odd move I check to see if it creates any immediate threats or something that will threaten me 2-3 moves down the line.
If no, I continue with my opening.
If Yes, I deal with the threat the best I can either by trying to block the move, pin or make a counter threat, depending on the situation.
Don't worry too much, the more you play, the more experience you will get, stick to your opening until you know it like the back of your hand, that in combination with experiencing what others do against it will make you strong in the long run.
I have been scouring YouTube lately for some chess openings. The 1 thing just about everyone who makes those videos tells you, is that, when you encounter a weird move, you should study that on the computer with an engine (after the game obviously). There is just one problem with this: I have no idea how to use the information I get from looking at those openings. I also don’t know what my opponent would most likely play. The engine does tell me what all the good moves are, but seeing as to how I’m low elo, that’s probably not gonna be played. So if you have any advice on how to study weird opening moves, it would be much appreciated