Excuse me for starting off with the kind of response your typical manga-hating art teacher would give you (it'll get better later on, I promise!), but you need
art fundamentals if you want to make anything. They're the
foundations for a reason, and they'll do you good whether you want to paint realistic portraits and landscapes, draw manga or draw Looney Tunes.
It's called
foundations for a reason. Without them, at best,
you risk trapping yourself with what you already know and not knowing how to branch out to other things.
At worst, you'll just learn a few graphic symbols or shortcuts to draw "manga" but without understanding it, which will be the drawing equivalent of sprinkling "arigato" and "konichiwa" and "kawaii" on your regular speech. There's this nice quote by
Richard Williams on the Animator's Survival Kit that says the following:
Epitaph of an Unfortunate Artist
He found a formula for drawing comic rabbits:
this formula for drawing comic rabbits paid,
so in the end he could not change the tragic habits
this formula for drawing comic rabbits made.
...With that said,
it is also a bad extreme to just focus on training the fundamentals without drawing what you actually like. So how do you bridge the gap?
Time ago I researched how to get better at the fundamentals, and after trudging through articles, websites, random snippets of advice and yes, Youtube tutorials (

) I found something that's been working for me so far. Let me share it with you.
This is basically a PDF document where a person has already done the heavy lifting of Google-fu for you.
It's a compilation of online links and resources (some of them paid, but most of them all free!) on how to learn and practice art fundamentals,
and not only that, it's arranged in the form of a school semester of sorts, so you know where to start and what to do next.
I'm using this as my
roadmap to guide my art learning. If you're curious about where I am at now, I made it up to block 7 since last year but I stepped back because I want to complete lessons at Drawabox (currently at the start of 2).
This is not instant. This is going to take you a long time. Maybe even more than the estimated 2 years that says there.
But it's so, so, so worth it if you love art and want to see your art skills develop to the best of your ability....Remember when I said you shouldn't put off manga until you've mastered the fundamentals? Because that's also part of learning.
(Drawabox Lesson 0, Part 3 - Changing Your Mindset and the 50% Rule)
You can and you should try your hand at manga even if you're not good at it yet. It'll help you round up developing your art skills, and on top of that, it'll prove to yourself that you can, indeed, make the things you've always wanted to make. And it'll help you with the way you deal with imperfection, mistakes, and the nagging fear of never being good enough. All of these are valuable lessons and you get them by drawing the things you like!!!
So yeah I don't have specific manga resources because that's not my area of interest, but I do like art in general and I think at least I can point you on some directions regarding the fundamentals. I hope it helped. I also
encourage to search stuff up yourself, even if search engines are wack nowadays. Yes, there's a lot of content out there that won't speak to you,
but by being interested in what you want to make and looking up things related to it (and especially about the process that goes when making them!), you will eventually find
gold.
I literally found the link above by searching up specific art fundamentals and hitting up every result on the first search page. For my actual interest, animation, I've found books, I found blogs, I've found courses by a former Disney animator. You'll probably find a lot of manga resources, and maybe you'll find a lot of them to be bad, but you'll have to discern, judge, keep what works for you, and discard what doesn't. Hell, I keep one book from the infamous Christopher Hart, and that's because despite everything, he has one insight about 2000's cartoons that I never considered and clicked something in my mind!
Don't limit yourself - if something from another area of art interests you, grab that too, and figure how to incorporate it to your art later.
With all of this said, I wish you good luck! Art is fascinating and huge and intimidating, but it's also immensely rewarding at a personal level
Sincerely,
Someone who thought would never make music videos up until the start of this week.