Applying Openings Against Less Experienced players

I have watched many videos on openings. They feel very theoretical. As in I feel like they usually discuss the main line. how would you apply this when facing a more beginner player where they don't know any of the lines in a position.

You might be better off learning how to play chess, rather than memorizing move lists.

Learn the ideas: pawn breaks, piece placement, which side you're attacking on.

If you know an opening but not what to do if your opponent plays bad moves, then you need to learn why those moves are bad or else those moves are good.

What are some good beginner and intermediate books for study.

I already knew those things, I guess I was just asking out of clarification. Thanks. This was in reference to my first comment.

I would consider myself more on the beginner side of chess. I am currently studying Chess Strategy in Action. I know this is slightly old, but would this be a good book for a 400 rated player. The answer is probably yes.

Why is it alwyas e4 d4? I know that strategically it is central, and is best for kings safety.

That was my strategy. You can also practice against higher rated bots for opening practice.

When you're at the low levels and your opponent plays 1. e4, playing just about anything other than 1. e5 will usually cause them to pause for a moment. It's not much, but you can potentially get a time advantage from it.