Help with Movement + Animation using AStar

Hi everyone!

I'm starting learning Unity and C #, I've read many topics and seein a lot videos but i can't find the answer. Maybe I dont know how to search those things.
My project is for Android.
All I've done so far was this:

(Yes, I'm using Pokémon sprites to make the learning more comfortable for me )

Now the problem is:

When I touch somewhere on the screen, AStar finds the nearest path to its target, so far so good.
But, why does the character swing from side to side? A grid based movement would be perfect.


And the Animation, I tought I could do it getting the next Waypoint Path and then animate according to it, but I couldn't do it by myself. (I've learned how to do the Animation with Brackeys, but he uses the Arrow keys and not a pathfinder)