Stick with bootstrap, it still works great and tons of sites still use it. It is even used in current react and vue templates so all good. There are people tha

Stick with bootstrap, it still works great and tons of sites still use it. It is even used in current react and vue templates so all good. There are people that hate bootstrap but if you know it and want to focus on backend and just get an mvp front end done stick with what you know. Personally I still really prefer jquery, and bootstrap but it isn’t the fad today. FWIW: We use Vue on our product and it is based on a bootstrap template which made it a super easy to transition. And I do like vue as it has made things super clean and easy without getting in the way with a heavy framework