seeking marine knowledge as a side hobby~

hello everyone 😄
I am very interested in marine biology. but not as career.
i love ocean and want to grab any possible chnace to run to the beach which is far from my place but it only take 45mins to teach there by walking.
i have one entrance exam on 21st june, i am sure i won't do well enough to satisfy my parents so they will limit my outing even tho it is already one isolation pahse for me (T~T)
oh that entrance exam is for medical field. i know i know~ i should be focus on great thing. but i am human too and need some hobby to make my mind healthy, ocean hapen to be my comfort place instead of house.
coming to the main point.
my summer vacation will start after 22 june. so i want to use it to do my hobbies .
as a beginner. idk what activities related to ocean is best to give a try, whether it's online or free or paid or outing etc. i wanna explore more and see what beautiful or ugly creatures our ocean have. i love them all!
let me know if you were beginner in this field, what would you do?
and what more exciting or boring things i can do to make a beautiful experience for myself despite the opposite condition at house.