Accenture

If your first goal is to learn the basics of developing a web app composed of a frontend that communicates with a backend through REST APIs, then I would go with the Angular + NestJS combo.

My reasoning is that they both use TypeScript (a superset of JavaScript) and the architecture of both frameworks follow the same patterns. Both applications (front and back) will be structured around Modules, Controllers and Services. You need to learn just one language, and since the frameworks are so similar, the concepts you learn from Angular can easily be related to Nest and vice-versa.

Once you learn the basics you can start switching frameworks and languages and going for something different.

Metabase is more user friendly and totally targeted at non technical people. Setup is super easy and it supports all of the most popular datasources.

You can give meaningful names and descriptions to your tables and columns. This helps the end users when they are creating the queries (called "questions" in Metabase). Question creation is all done visually, you can even join tables and do aggregations (group by) without coding any line of SQL, although SQL can be used for more complex cases.