First of all what version of Monhun are you playing?
For general tips:
Congalala has a lot of health for a begginer monster and it's the first one to give certain annoying status effects, try to stay away from the front where it swings it's claws, attack the sides or his butt, you can tell pretty early if he's gonna fart. Still getting a lot of dehodorant is a must. Also try to stay close as to not make him trigger his belly jump attack on long distances, and practice jumping away when he's gonna belly flop the ground.
Cephadrome has the exact same moveset as the Cephalos so practice with those a lot first, get used to their moves there's no other way around it, maybe since Cephadrome it's taller you can get between it's legs to deal more damage, but pay attention to the hipcheck attacks. Of course bring sonic bombs, as many as you can, and gunpowder ans scremers to combine together to make more.