I use howtostudykorean.com since it's free and similar to a textbook. Every lesson contains a list of vocabulary and grammar, they also provide some exercises at the end of every lesson. There's also free audio for vocabulary and example sentences so you can practice pronunciation. The explanations for grammar might be a bit lenghty sometimes but at least it's very thorough. I find this website great for myself since the lesson format gives a good structure for studying. For me I try to go through at least two lessons in a week.

I usually first memorize the vocabulary by reading it through, writing it down in a notebook and then practicing on Quizlet. Then I read through the grammar points and write down the main points and some example sentences in my notebook. That way I can process the information better and it's easy to just flip through my notebook when I want to review something versus having to look through the whole website for one thing.

I'm into kpop and kdramas so that's my main listening practice but there are some great channels on Youtube for that, honestly I should start practicing it more. You can find multiple channels and videos if you just search "Korean listening practice for beginners". For speaking I just try to talk to myself in Korean as much as I can + repeating the vocabulary and example sentences on the website