#1
I have been learning the guitar for a couple of weeks. I am slowing down in terms of progress. I have got into the habit of learning songs that I want to play and avoiding things that are probably very important like learning chords not in the songs and pentatonic scales/theory etc.

Any tips for keeping things fresh?
#2
I would say that you answered your question yourself when you mentioned that you should practice things that are "probably very important". I guess I'd have to ask what you want to get out of playing the guitar. Do you want to have fun or become a technically proficient guitar player?

If you just want to have fun, Well, people at every skill level of guitar playing hit a wall every now and then. It can last months, but it will pass, so I wouldn't worry about it. Things that I find useful: Switching between guitars (particularly effective if you play both acoustic and electric), trying a new technique, and trying new music. I find it especially effective to listen to music that inspires me to play.

If you want to be a technically proficient player, then practice wont always be so fun and you'll just practice scales, chords, and arpeggios eight hours a day. Realistically, everybody finds a balance between these two somewhat opposing goals.
#3
You're not slowing down your skills, on the contrary, you are doing the right way learning songs. All the rest will come along the way ^_^ Good luck!
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