But I can't play slide. Would love to though. Do you have any tips?
Sorry for the long post.
Tips that spring to mind.
Get an old guitar, the flatter the fingerboard radius the better, jack the action up a little, tune it to an open chord, get a bottleneck and experiment (and go on Youtube). At the start go somewhere where you cannot be heard if possible, learning slide can often sound painful. (I've heard it described as "at times like you are trying to skin a live cat" but I wouldn't know what that sounds like!)
Try a few different tunings, I prefer open G - D G D G B D (low to high), or move it up to A if the strings are a bit slack. Sun House uses this tuning or something very similar. The Ry Cooder songs I have tried to learn are mostly in open E I think which make them difficult to play on open G even after you have transposed them.
When playing riffs or melodies I don't think of what notes I am playing as each string is a different interval from it's neighbours, I treat it as a series of patterns (pretty much what I do on bass especially when I am singing).
If you are using an electric guitar a little overdrive and reverb or delay can improve the sound.
Muting strings is important when you are playing single notes, for chords let them ring.
A bit of vibrato works wonders at disguising the fact that you didn't quite hit a note.
Record yourself for critical evaluation. One night I was playing and singing and was unaware that my son had come home and was sat in the next room listening to me. After a while he walked in and said "your playing is fine but your singing sounds like your heart isn't in it". I recorded my next practice and he was right, I was concentrating on the playing and not putting any effort into the singing.
Once you get the hang of it you can fret behind the bottleneck to create minor, seventh and other chords (if the action is high enough).
Back story.
Slide is something that fascinated me ever since hearing the Muddy Waters LP "After The Rain" and a John Lee Hooker LP (the name of which escapes me) some time around 1969 .
I never started to try to learn slide until about 2005, the morning after a gig from hell (long story, not relevant here). I slackened the truss rod nut on my old acoustic guitar to raise the action a bit, tuned it to an open chord, found a bottleneck that I had bought years before (with every intention of learning) and off I went.
My only instruction was an article I had saved that appeared in a UK guitar magazine, it went over a few tunings and showed you how to play the signature riff from "Dust My Broom".