Yes. Learn playing in standard tuning. While I would be the last to talk about learning the wrong way since I became a serious player oh so long ago but chose to forego actual theory. It's easier in some ways to not go down the road of theory because it can be challenging to learn. I regretted it and still do. It's the reason I'm at Guitar Tricks. I can play pretty darn well. As my wife watched me pick it up again recently she was shocked that I played as well as I did and told her sister that 'really, he's like a real guitar player'. Rah, rah for me except that I am limited to only what I know and am finding that it absolutely limits me in what I want to play. That is, unless I stick my nose to it and understand how things are supposed to work.

Instructor Chris advised me that even if my ear and hands understand a bit of what works, actually understanding the stuff the right way opens up what an how you can play so much more (I'm paraphrasing).

Drop D is fun and I love that throaty vibe. Keep playing that because you dig but my thought is to do that along with the other stuff. It's gotta be fun to play so don't give up on what you like doing but look for other standard tuning stuff that turns your crank too and work on that. So much to learn on the guitar and the more you learn the more fun it gets.