The goal of Skyblock is to survive with very minimal resources. Players start on a very small piece of land with what appears to be a random collection of items in their inventory. By using these items, however, you can create a flourishing home.
You have to be careful when using your resources, because each one has a purpose and you only have one chance. (If something goes wrong you might need /island restart)
You can team up with up to 4 other players in Skyblock. Each player can only have one island, so by creating an island together that will be the only island your allowed to have. This is great for players who don't want to have their own islands and only wish to work together.
To create an island together, have one player create an island. That player should then invite everyone else with /island invite <player>. Everyone else will have to accept the invitation with /island accept
Players who you have not teamed up with will be able to visit your island, however they will not have permission to modify the island or do anything on the island.
Getting started can be difficult, because you only have one chance to use the items in your inventory.
The rest of the items have a purpose! You will have to collaborate with players online, or discover them for yourself, to continue your adventure.