Always be at full health to survive falling into the void.
Shift+right-click a chest, machine or animal to pick it up.
If a quest has a description, you should read it.
Put a block above your Snowman, so that the rain doesn't kill him.
Make a separate setup for every metal.
Grind Leaves to essentially get more food.
Make sure to automate just about everything.
When creating an island, make sure that you're in a good biome.
Press "X" to switch between inventory rows.
Press "Backspace" to go to the previous recipe in JEI.
Use the Lava you already have to make more Lava faster.
Make a Sand generator with Lava and Liquid Starlight.
Do /foodlist size to see how many more different foods you need to eat to gain hearts.
Press F7 to see where mobs can spawn.
Use the scroll wheel to quickly go through all the possible ingredients of a recipe
Press up and down to go through previous JEI searches
Light up your whole base in case of a Blood Moon