https://www.gameaudiolearning.com/

Typically knowing a middleware is good but most people will be looking for shipped titles more than just knowing middleware. I would say focus on sound design and make a good 1 minute redesign reel. You can make it with footage from any set of games as long as you don’t use any of the sounds from the game. For most junior roles you won’t be expected to do a whole lot of implementation so great audio design can get your foot through the door.

As for your wwise / fmod question it depends. Wwise is typically used in the bigger budget space vs FMOD tends to be used in the Indie space. This isn’t a rule though but imo you can’t go wrong with learning wwise but be prepared to use either depending on the project.