Your games are not decided on the opening. Your games are decided on blunders.
Ruy Lopez Repertoire

Like I said, I don’t want advice on my rating. I want to know how to play the opening correctly. I correct blunders by playing chess 24/7 and I’m improving rapidly. If you’d answer the question, I’d appreciate it.
Ruy Lopez Move by Move
https://web.archive.org/web/20140627022042/http://www.chesscafe.com/text/hansen153.pdf

Probably a good place to start would be the Opening Explorer. Maybe spend a few hours just following lines that make sense to you. Keep a record of the names of those variations that appeal to you and then hit the web and watch some videos. Of course I've tried all that with various openings and I still suck, but I'm old and lazy...LOL.


,the real question is, can you exploit your opponent opening mistake into an advantage and convert it to a winning game?, when you outplayed your opponent in the opening you're supposed to keep hold on the advantage and win the game. at our rating it certainly seems very hard. very strong player learn opening theory because they have a great understanding of the game and can exploit enemies slight opening mistake.
i suggest learning endgame if you're faced with a lot of draw against lower rated player. it means you can't exploit their mistake in endgame. therefore by learning basic endgame you can make draw position a winning position. also when i was a beginner i used to play 1.d4 2.Qd3!! and still can get away without getting punished in the opening stage
if you can punish your opponent mistake in the opening then go ahead, learn lots , lots of theory by
1. https://en.wikipedia.org/wiki/Ruy_Lopez read it
2. see opening database and chose your repetoire, based on popular response / winrate
3. check and analyze master games with the opening you want to learn. to know the ideas, preferably annotated ones
4. play
I play the Scotch as White, and I’ve found that it’s drawish-ness, which I used to like, has now brought me many draws against lower rated players. I want to switch to the Ruy Lopez, but this is a TON of theory and regardless of my rating, there will always be a 10 year old who memorizes 20-30 moves deep and I want to be able to hold my own against these types of players. How do you recommend I study this huge amount of theory? Where do I start?
Note: I don’t want advice based on my rating. Also, I’m already familiar with some lines, but I don’t really know ideas. I also want to avoid spending over, say, $20 on materials if that’s what you recommend.