Getting started with the game is not that hard. Once you spawn, you might notice the quest in the top left corner of your screen. Completing these quests is quite usefull and will teach you some of the basic mechanics of the game. You can find quests by giant floating orbs above buildings.
For the first few quests they will ask you to move and look around. I don't think this needs any explaining. After this the game will ask you to complete the 3 remaining quests.
1:The old farm.
The farm is your home now. Here you can place your chests and crafting stations. So why live in an old ruin?
First of all you will need to repair the workbench. Gather some wood by smashing trees with your fists, walk up to the workbench and interact with it. It will give you the option to use your wood and repair the workbench.
When this is done , you can now craft your armor. Gather some cotton from the island and use it in combination with the workbench to craft a piece of armor. You can follow the stars for the more detailed process
After that, game wants you to place a few blocks. You can smash the stuff in and around the house to get some refined wood blocks. As a finishing touch, you can gather some weath, go to your workbench and craft straw blocks for your roof.
Portals are used to travel to other worlds. As you progress in the game, the portal shards will change color. This color is based