Basic JS frontend framework for backend dev

I'm a backend dev, working for myself for 20 years. Think bad practises instead of best practises, frameworks built up that work for me (Well worked for me) over the years. I've been exposed to little bits of everything over the years, however mostly I've made desktop apps. The one thing I have totally avoided exposure to is SPA / JS frameworks. Hands up time, the JS I've been forced to deal with, I haven't liked (I like compiled apps). Anyway, that's my