https://steveiscritical.com/smma-info/
It's not exhaustive by any means, but I feel it's best to dip your toe into a little of this person's style or that person's style and see which people resonate with you.
There are also many lanes of digital marketing and I am bit jelly of those who are really awesome at any one of them - kind of like that 'you suck at excel; video.. so best to get a nice overview and start to dive deep in the areas that resonate with you.
I put some info in random blog posts as well, (https://steveiscritical.com/) like the linkedin learning, meta certs / learning, and CRO courses - which are great as well imho.
It's fun, there is also lots to learn, and there is more of a science and tech to it these days than just being an 'art' I think.
There is evidence in marketing techniques if you are allowed to use conversion pixels and can see the journey someone came through to book / buy.. and rabbit holes in youtube that expose some of the pseudo science of things like 'smart campaigns' that are really good at getting clicks and taking your money..
I need to update these pages with more info and make some layout updates one of these days.