To use an attack Press the 1,2,3, Or 4 Keys to attack, Note that, There is a Cooldown for all the Attacks

Similar to other game's like this, The Easy-ist way to kill an Enemy is by, Running in circles and hitting it until it dies

As you (Probably) know, all animals need food or they will die, So to avoid this, Try finding trees, once you find a Tree click on the Tree to eat a Piece (Click and Holding on a Tree will NOT have your dino Keep eating)