Only one program can listen on a port at a given time usually. Something’s listening on port 443 (the standard HTTPS port), and when nginx starts up it tries to listen on that port and can’t. You can figure out what’s already listening on that port with commands like lsof or netstat, see here for examples:

https://superuser.com/questions/42843/finding-the-process-that-is-using-a-certain-port-in-linux

In case anyone’s still checking here for recommendations, here’s a few more reasonably active communities:

• !loops@midwest.social: fun or interesting loops (i.e. TikTok/Reels/etc but better)
• !moomin@sopuli.xyz: Come see the cute characters created by Tove Jansson
• !internetisawesome@sh.itjust.works: celebrating fun and cool sites across the web
• !insanepeoplefacebook@lemmy.world: when you want to feel well-adjusted and normal, look at crazy people’s social media posts
• !cyanideandhappiness@lemm.ee: for the webcomic Cyanide & Happiness
• !thefarside@sh.itjust.works: for the comic The Far Side that we all know and love
• !curatedtumblr@sh.itjust.works: the best that tumblr has to offer
• !cartographyanarchy@lemm.ee: for cartographers with nothing left to lose
• !calculators@midwest.social: for nerding out about those handy devices
• !mealtimevideos@lemmy.cafe: Not too short, not too long. Videos to last through your meal.
• !xkcd@lemmy.world: A community for a webcomic of romance, sarcasm, math, and language
• !artporn@lemm.ee: Look at some nice classic art
• !twosentencehorror@sh.itjust.works: Read the title, then read the twist
• !ancientinternet@lemmy.world: Memes from the days of yore
• !stable_diffusion_art@lemmy.dbzer0.com: See cool art created by AI
• !shortstories@literature.cafe: Cozy corner for short stories
• !science_memes@mander.xyz: A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab
• !sillynsfwart@lemmynsfw.com: Because sometimes lewd and funny go hand in hand