I've been working for a while on a school project which involves menustrip items in a C# windows forms application. I'm currently working in Visual Studio 2019. I've tried over and over again to find a way to conveniently add "click" event methods for each items of the menustrip and I have only found one solution via contextmenustrips from a youtube video (https://www.youtube.com/watch?v=UE5FuSjm3d0). The problem is that I have some menus with multiple items and the solution above doesn't work for such a case.
What am I missing? How can I add proper on_click or click events for the menustrip items?

That is the proper way to do it from GUI. If you want to add the click events within the code, you can write the menu name, '.' and select Click, then type '+=':
VS will prompt you for an event handler, type TAB once to write the handler to the right side of the assignment, type TAB twice to automatically generate the method.