I dip into LingQ (free version) occasionally for source ideas, for example podcasts. To be honest, their library is rather better organised than here.
But I much prefer Readlang’s cleaner interface, and to keep all my vocabulary in one place, so I do all my reading, listening and a lot of YouTube viewing on Readlang.
As for sources, it depends on the level I’m at with the language. I’ve already read a lot in French and Spanish, so I use mainly native-speaker material for those, predominantly YouTube videos, but also the occasional novel.
For languages I don’t know so well, I use Duolingo for basic vocabulary and structures. I then use Readlang’s AI story facility to write stories based on the vocabulary for the unit I’ve just done. At the moment I’m quite into Dutch, and have been getting Readlang’s AI feature to write me articles on Dutch history.
For Dutch, there’s also quite a lot of news material aimed at children on YouTube, plus at least one app. I usually just watch or read these, but upload some longer stories to Readlang.
I also find stories on YouTube, mainly AI generated, I imagine. There are a lot in Dutch, German and Italian, for example. And from what I’ve noticed, Spanish is also well-served here. Perhaps not of the greatest quality, but my aim here is to acquire vocabulary rather than read great literature. That can come when I know the language better.
I also get Notebook LM to generate podcasts on.whatever interests me. You can choose your level here. And Readlang deals with the transcript. Notebook LM can also generate texts, for example summaries of longer texts or videos, again at a given level. In fact, it seems to get better every week.