Ask HN: stack recommendations for a lateral mover (2022)?

Working as a "quant" right now but I want to broaden my horizon into web development (have some ideas that I want to try to build, and also want to futureproof a bit because I moved to a location with few opportunities for quants). I have a math background and I do lots of programming - Matlab, R, Python, even some web apps in R/Shiny and hosting my own, very basic static site - but it's nothing like modern web development as far as I can tell (the crux is usually the math/stats modelling and data handling). It's just dizzying trying to get on top of how many web dev tools/frameworks/languages there are and how fast everything seems to be changing. Been lurking here and reading up for a while, I just wanted to ask for some tips before I start. I feel like I have a decent grasp of the programming basics (data structures, OOP,...) and Linux CL, and I have an idea for a simple (Sudoku) app that I'd like to build. My idea was to look for tutoria