I mean it all depends on the guitar but
1. Switching to a lighter string won't give you any issues unless it's a drastic reduction of tension. Go the other direction and you'll have to set up your guitar again (new players should probably use a guitar tech to do that if they can afford it but it's pretty easy and useful to learn). I say stick to what your guitar has, it will give you resilience in your playing in the long run.
2. I would restring my guitar and thoroughly clean bridge and nut to start. Then I would take a sharpened pencil and draw in the grooves where the strings go to fill in any fine gaps that the strings are getting caught on.
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