What are some cool new technologies/databases to learn up?

Postgres, though not new, has some incredibly powerful features these days that make it worth investing in.

- JSONB column type, get NoSQL-esque document storage when you need it.

- Generated columns, computed from other columns without the need to maintain triggers or syncing app code

- Extensions, all kinds of OSS and SaaS-based extensions that add powerful facets to your DB

https://cuelang.org

Maybe quantum related stuff like Q#.