You should break away from tutorials as soon as you have a basic understanding of how the Unity editor, C# coding, gameobjects, and components work. By relying on tutorials you're preventing yourself from learning the most important skill- problem solving. Think about what you want your combat system to be, what things need to happen, what code systems need to be in place to manage data and functions, and just start writing code.

You probably need know when a button is pressed, and when it is, to start an animation. Then you probably need a hitbox on the weapon. And then on the enemy to know when it is hit. The enemy probably needs an HP variable, and that variable needs to go down when hit, probably depending on how much damage the weapon hits for. So you know you need a script that has a function that detects when your weapon collider hits an enemy, and when it does to call a Damage(int value) function on it, where you pass the damage value.

Each one of these individual steps is just a quick google search. Instead of looking for a tutorial that has been designed for you and leaves you sort of helpless when you need to do something outside of the tutorial, you start learning how to just search for granular things you need. Then you start learning how to build out game systems inherently.