If you combine Remote Desktop with Pertino, a cloud-based VPN (free for up to three devices— read our review), your remote PC will be reachable without all the firewall and IP address hassles.

Although I first got interested in remote.it because I thought it could be used as a virtual private network (VPN) alternative (to hide my IP address to websites that I visit, for example), the ...

If you want to enable Remote Desktop Access with xrdp on Raspberry Pi to connect to it using any device of your choice, see this tutorial.