For Jellyfin, dont get any lower than 8th gen if you want to transcod using quick sync. And if i correctly remember, you will nee 10th gen or higher for 10bit transcoding.

Can i use it to store my note in plain markdown format instead of in some kind of database?

I use tailscale and it is great, i dont mind activating a vpn whenever i want to acces my services, but that is an extra weird step for my sister to access my jellyfin library. Do you use a reverse proxy? If so how many ports do you have exposed (say for 10 hosted services)?

Would you please share what dynamic dns provider you use? I remember trying to set nginx pm to use my no-ip hostname (xyz.ddns.net) but I could not figure out how to link my hosted-services as subdomains (say portainer.xyz.ddns.net)