I usually recommend w3schools for a basic HTML/CSS tutorial https://www.w3schools.com/html/html_intro.asp You can look through the navigation on the left side and choose which topics you'd like to learn specifically. It's also a good reference to look back to every now and then while you're coding if you need it.
If you want to try watching a video, you can check out Kevin Powell's videos: HERE You can code along with him ^v^ If you're only going to be coding on toyhouse and want to get straight into it then I think you'll only need to start from his Part 3 video. You can still watch the first two parts though if you want more background info.
Toyhouse also uses the bootstrap framework to style HTMLs, so I recommend reading up on it as well after you learn HTML/CSS basics: https://www.w3schools.com/whatis/whatis_bootstrap.asp
https://getbootstrap.com/docs/5.3/getting-started/introduction/ (this one is the bootstrap docs, you can also use the nav on the left to choose which ones you want to read about)