SWAG is great for overwhelmed Nginx beginners. It comes preconfigured with reasonable defaults and also provides configs for a bunch of popular services: https://github.com/linuxserver/reverse-proxy-confs. Both Bitwarden and Vaultwarden are on there.
Note that this setup assumes that you will run your service (Bitwarden/Vaultwarden) in a Docker container. You can make SWAG work with something that's running directly on the host, but I'd recommend not starting with that until you've fooled around with this container setup a bit and gained a better understanding of how Nginx and reverse proxies in general work.
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cum broth
Steps: 20, Sampler: Euler a, CFG scale: 7, Seed: 3565436420, Size: 512x512, Model hash: ec41bd2a82, Model: photon_v1, Version: v1.4.0