@elettrona with an old laptop I started my #homelab career :-)
Before I was playing around with self hosting on a raspberry pi. But at that time, it was not powerful enough for hosting gitea (now #forgejo) on docker. I used it for hosting paperless-ngx, forgejo-runners, nextcloud and a Minecraft server for my nephew. Actually it was still running until this week!
When I'm on a trip, I''m using an old Macbook Air (2013) for mails, internet and some programming. It runs smoothly with Manjaro and Kde plasma. For WiFi I bought a WiFi Dongle.