I’m about 1/2 way through reading “How to be a stoic”, so far its a good introduction.
An interesting book which is more complete but still readable is Stoic Notes written by Rymke Wiersma, translated in English here: https://modernstoicism.com/a-free-book-stoic-notes-by-rymke-...
The best modern book, in my opinion, is Pierre Hadot's The Inner Citadel. It's primarily about Marcus Aurelius' Meditations, but does a really good deep-dive into Stoicism (and frequently mentions other Stoics).
If you're interested, feel free to sign up to Stoa Central. Really, I would love to have some intelligent people to have discussions with.