Well, a good place to start is by looking up online guides or discussions from fellow fans. They often provide clear indications of where to pick up the manga after the anime. Another option is to check the official My Hero Academia websites or social media pages for any recommendations.
The best place to start the MHA manga is from the very beginning. It gives you all the background details and builds up the story nicely. You won't miss out on any crucial developments that way.
The My Hero Academia anime has adapted a considerable amount of the manga. However, it varies depending on how you measure it. Some key moments and characters have been brought to life in the anime, but there's always more depth and complexity in the manga that's waiting to be explored on screen.
It depends on personal preference. Some people think the manga is better because it allows for more imagination and detail in the visuals. Others prefer the anime for its animation and voice acting.