Master the C chord
Some of the first songs I teach my students who are taking private guitar lessons are For What It’s Worth, Brown Eyed Girl, and Your Mother Should Know. Then try songs like All You Need Is Love, American Pie, and Me And Bobby McGee which are a little faster and have a lot more chord changes in them. Songs like You’ve Got To Hide Your Love Away, Wish You Were Here, and Wonderwall seem to be a lot more challenging for most students and should be saved for later.
“One” by U2 and Heart Of Gold are good ones to learn if you’re working on the bass strum technique.