The apartment that I moved into had nail holes left over in the walls. I decided to repair them so the walls looked better and so I could hang stuff where I want!
It's super easy to repair holes in the wall. All you need is:
Spackling - you can pick up at any home improvement or general store such as Fred Meyer or Target
A spackling knife - usually located right by the spackling
Touch up paint - note if it's been years since you've painted the paint might not match perfectly. Also make sure you buy the correct sheen aka glossy, flat, etc.
A paint brush
Optional: Sand paper - To smooth the edges if you are messy
First wash and dry the wall after removing the nail (of course!) to make sure that the wall is clean and dirt/dust free. Paint doesn't adhere very well to dirt
Second use a little of the spackling with the knife to fill the hole. Try to use a little as you can and use the knife to scrape off the extra. If you get a bunch on there, after it dries, you can go back through with the sandpaper to smooth the edges. Let the spackling dry before painting and sanding. I usually wait overnight.
Finally paint over the spackling and you're done! Make sure that you get the paint in nice, even coats over the spackling!
BEFORE & AFTER
Let me know if you have any questions or tips! :)