There are several different kinds of trees in Valheim and two different kinds specifically in the Meadows biome. The larger Beech trees can be chopped down with the first axe you can craft and are the dominant tree in the starting area. You'll also see the skinnier white Birch trees that gives you "fine wood" once chopped down, but this requires a sturdier axe. You will need to defeat Eikythr so you can start acquiring copper to make the bronze axe. This axe will be able to chop down Birch, Beech, Oak, Pine, and Fir trees.