First I would recommend Duolingo since it’s free, you won’t be able to learn using only that, though, since they don’t teach you hanzi memorization, you go there for grammar. Then, I’ve been using LingoDeer for Japanese and I’ve to say that except for a few nitpicks it works pretty good, they teach you pronunciation, and a few other stuff that Duolingo doesn’t have, but it’s paid and I can’t talk on how the Chinese tree works. Then CharacterPop is good if you want to look for radicals, hanzi or they meanings and so on. Remembering Simplified Hanzi by James W. Heisig is a good book to go through as you practice with more tools.

Still I feel like you would need something like WaniKani but for Chinese, which helps you remembering the hanzi, of course you can always build your own Anki deck, but it is hard to create such a good one with mnemonics, pronunciations, meanings, etc.

On top of all that, I would strongly suggest you to go with a professor at least the first couple of classes, or until you get a hold of the pronunciation, since tones are a pain in the ass to learn by yourself.

Also, check https://lemmy.ml/c/chinese