openings to build strong foundation
how about you just focus on one opening at a time instead of trying to understand five white openings at once
Personally, I simply look through many openings and just pick one that seems interesting to me and learn it. It really isn't based on any logical sort of decision.
I am obviously trying to pick one and learn it better- ruy lopez and Italian! Exploring them together to see implications and impacts of the moves. But then there are so many variations of any openings, is it about just keep exploring?
The disappointing answer is that any sound opening will have instructional value. They just differ in what they're teaching! I have had an opening nomad habit, that I think has largely benefitted my chess play because it's taught me a wide different array of ideas.
My advice on openings is first learn the positions that speak to you that you enjoy playing. Then learn the openings that you hate playing. The first will cultivate your love of the game, the second will work your weaknesses.
All the openings you have suggested in your first post are great! You can't really go wrong in any of them. If you choose one, stick with it for a while, it'll help your chess. All of those openings are proper openings - not just tricks.
If you're overwhelmed with choice and assuming you're ok with any of them, maybe you could consider which one would be the more simple one to learn? Black has many different approaches against the Ruy Lopez.
If you choose the London, Black probably only has a handful of responses against it. Similar to Vienna Game.
So maybe you can choose London for simplicity. You'll pretty much get your structure/system in each time.
You could consider sticking with it for some time, and see how you find it. If you don't like it, then you can try another opening.
All the best!
Just let your interest guide you and be curious. You improve over time by trying out alot of different things. But d4/c4 and 1. e4 you should play at some point. It's hard to understand chess without understanding those moves. And you will never go wrong play the sicilian as black. Against d4, I recommend playing a slav of some sort.
It takes a while to know what openings you like. You have to know what they feel like to play, and why you like them. It's a personal decision.