A kelp XP farm, in which dried kelp is used to smelt kelp in an endless cycle, is one of the easiest ways to start off.

Instead of grinding for XP ... wool farm is also helpful. Setting one up with a sheep, a dispenser, and shears is somewhat difficult, but it makes collecting wool so much easier. Kelp farms ...

The first of the three is probably the easiest XP farm to create, and it doesn't require any combat whatsoever, as you're farming experience by using furnaces. The video goes over absolutely ...