I've seen this advice generally for open ports and self hosting, let's say I do have a Minecraft server only open on 25565, what risks do I face if I just only opened that port?
I do have my own private Minecraft server in a dedicated Linux VM but it's currently behind a VPN, which makes it an extra step for new players to join.
So I have been getting bored of Minecraft but felt like having a twist on my own new single player survival world.
So last week I started out in Minecraft 1.5.2, which was the version I started playing on, and I intend to slowly upgrade the world, along the way collecting mobs, blocks, items and world generation not possible in later versions (dubbed Discontinued Items).
My latest endeavour was actually switching to the 2013 April Fools version, Minecraft 2.0, and obtaining things like enchanted signs, creating setups for floating blocks (ladders, torches, floating sand/gravel, etc.), things that will survive the upgrade to 1.6.