I am rather proud of my characters and settlements and would like to show them off but am somewhat confused as to how to go about sharing them with anybody who is not on PS4 (say here or on other forums).

I see other folks doing it, but don't really know the methodology.

Can anyone give me a quick tutorial as to where to share them to from my PS4 so that I can post them easily for others to see?

I don't know if there is an other/easier way, but I just copy my screenshots and videos to a USB stick.

Then all you have to do is plug the stick into your pc. From there you can upload them to wherever you want. I personally use photobucket for my screenshots.