It's a more philosophically contextualised version of the kind of thing cognitive behavioural therapy tries to do, but I found that context particularly helpful.
Without that context, it's basically addressing any situation on the basis of whether it's something I can affect practically - and if so, doing the necessary thing to move the situation on in the direction I want - and otherwise addressing my feelings about it so they don't overwhelm me. But the philosophical and historical context is what gives me the tools and frames of reference I use to actually do that successfully.
I did a couple of Donald Robertson's remote courses when he was teaching at Exeter University, including the free annual Stoic Week. Previous handbooks and course materials are free to download from https://modernstoicism.com/stoic-week/ (2015 was a good one, IIRC.)
Robertson is also cool because he's happy to ban alt-right tools from his online spaces, occasionally with pertinent historical footnotes. (There was a whole flurry of MRA types very committed to "this is manly philosophy for emotionless manly men who are also very white" around about the time I was engaged with it, so that was great.)
This Teach Yourself book he published is a really approachable summary (the ebook has an extra chapter vs the print edition, if you decide you'd like to read it): https://donaldrobertson.name/stoicism-and-the-art-of-happiness/