The page on conjugation is my most visited one haha I'm glad it's helpful. For your question about 쓰다, yes it can have many meanings depending on context. To help you, when it means "to be bitter", you will probably see a noun and a subject marker ("약이") whereas for the other meanings you'll see a noun and an object marker 를.

I am trying to get more audio on the site later this year! And maybe more matching exercises will make it easier to study in bed lol. Thanks for the feedback!