Need some help improving.

I'm high tier SC2 user.

I recently learned to play AOE2 HD. I sometimes have probs with building up econ. Never know how to wall my base. Sometimes the enemy just sends a bunch of horses to kill my peasants. And they can't get away. Also maybe like 20% of games, I lose a peasant trying to lure a boar. Just can't get back to base on time.

I also have a problem with fighting. I have Attack on "A" button. So I hit 'A', and L-click to a point. But sometimes my units will just walk past the enemy to get to the point without even fighting on the way.