Direction for Newbie to Web Core: Miletus vs PWA vs Generic TMS Web

I'm a long time Delphi programmer new to web development. My current FMX application runs on both PC and Mac. I want to move to a web front end utilizing HTML/CSS to run on multiple environments but I'm not sure as to the best starting point - Miletus, PWA or basic Web Core. I would appreciate any insight more experienced users can provide. Thank you

Miletus: if you want a cross-platform desktop app that needs access to local operating system, file system, ...
PWA : if you want installable and offline usable app for mobile devices
Classic web : if you want an app running in the browser from a webserver from everywhere

very helpful, thank you