Understanding what you see... No matter what technology you use... is vastly more important that the technology you choose.
https://doctorsonar.com/ is a fantastic source not just for learning how to use your chosen technology, but also how to choose, install and setup your tools.
He has a ton of free information as well as paid course material. It's the perfect time of year for anyone and everyone to up their game by becoming more proficient with their eyes under the water.
I'd start there, increase your knowledge, THEN choose a direction.