I went through the first html lesson – the kitty photo app thing – and wow are there a lot of elements and attributes and so on to hold in my head!
It would be super helpful to have a glossary to summarize each lesson… does freecodecamp have something like that anywhere on the site?
No, fCC doesn’t have something like that, that I’m aware of.
I know, it seems like a lot to remember at first, but with repetition it’ll become much easier. I strongly dislike memorizing, and never tried to memorize html tags and attributes: and I learned to write markup without needing to look up tag names that often in a few months. There are a set of the most used html tags that you’ll need to use all the time, like divs, inputs, labels, h1s, sections, ps, etc., and those will become second nature before you know it. Just keep coding! 
In case you ever need to refresh your memory (or learn something new), here are some widely-used resources:
W3Schools is more beginner-friendly, and MDN is more extensive, professional and, I will admit, occasionally a little complex for us novices. But I don’t think any website (other than fCC) has taught me more than MDN Web Docs.
Hope that helps!
Try w3schools
Eg HTML img tag
Even as a beginner, i would strongly recommend, MDN.
Agreed, @yula . Even if you don’t understand all parts of the article, the quality next to W3Schools is incomparable.
W3School in itslef is great but when compared to a mozila W3School comes in second…