Visual Studio Code
I don't really use it anymore cause I use Vim for everything but it's the one I would recommend to all of you.
For any web project that I start now, I use Next.js. This tool gives you an automatic hybrid setup of ReactJS (so, client rendering for browser navigation + SSR) with the file system as the router. I also use it to build lambda-based APIs as the client's backend.
Next also allows you to use a CMS to prerender all pages and use a CDN to quickly serve all files as static. That's what I use to build the site you're looking at right now.
In the server I use NodeJS but I rarely need it since I went serverless thanks to NextJS lambdas.
For data persistance I started to use (and love) the open-source alternative to Firebase: Supabase. It’s a database service with great DX. From their website is really easy to create and manage SQL tables (and make queries as well). But what I appreciate the most is the library react-supabase: It easily lets you not only use normal DB requests in your app, but also use the real-time API that Supabase has, via Hooks, and make one-liners like this one - with a simple hook, you always have live data in your UI without any effort.
I'm writing these lines on Storyblok, the CMS of my choice. I use it to generate static content with NextJS (JAMStack). I like it cause it has a visual editor that connects to your React components so you can directly see your content changing live.