Lot of sales for 4th of july (and ongoing ones) where you can pay $10-$14 for a YEAR of a small cheap VPS. Usually only has 1GB of memory, but that’s plenty to play around with and learn. If nothing else, a good cheap ipv4 you can use for some port forwarding. There are lots of options, but I’ve used racknerd and ethernetservers which have been fine.
I have my own server at home, but I bought two small ones to start learning Ansible with in a risk free way. Eventually plan to redo my main server with a complete Ansible setup, really want to hop on that “infrastructure as code” train.
One thing to look at if you’re going this route is whether your router supports NAT loopback (a.k.a. NAT reflection or NAT hairpinning). This feature means that you can access your server via the external IP (and therefore via the ddns domain name) even from within your network. It’s really useful for phones and laptops that might be on your home network at some times and off somewhere else at other times, so you don’t have to change configurations on e.g. the Nextcloud client, or remember to type in different addresses inside and outside the network. Some routers just do this, some don’t, some it’s a setting you have to turn on. The router built into my ISP-supplied cable modem didn’t support it so I got my own router and put the ISP one into bridge mode.