Hello. I've been playing guitar for about a year and a half now. Haven't taken any lessons, no classes, nothing. I've been teaching myself by reading tab and just playing some of the things I think I could handle. I play alot of Tool, Led Zeppelin, and Metallica at the moment. I was wondering if maybe there were some exercises I should be doing to get better? Every time I've played, i just jam some of the songs I know. But recently, Ive noticed Ive kind of been stuck with the songs I've been playing. I want to get better and faster, and I just think maybe there were some techniques or something I should of started out with? Maybe some exercises I should practice?

Thank you all.