Don´t die.
Cling to a wall with Space, it allows you to perform wall jumps.
Find ammunition and food in aid-packages inside buildings, or call one on your own. 
You can craft weapons and ammunitions using a WorkBench.
It´s much less probable that zombie will hear you if you use a silencer.
Hold right-click to aim with your weapon.
Use experience to unlock new skills, you can open the skill menu with Y.
Aid-packages inside buildings can contain usefull tools like night-vision googles.
Aid-packages inside buildings can contain usefull tools like grappling hooks.
Aid-packages inside buildings can contain usefull tools like parachutes.
Aid-packages inside buildings can contain usefull tools like backpacks.
Use a crafting table to apply attachments and dyes to your weapons.
Use wood to build bridges and connect rooftops.
Craft bridges with three slabs and two fences.
Monsters will team up to take you down.
Monsters will hear you placing blocks, be silent.
Building will be crowded with zombies, even in the day.
Zombies will try to destroy your light sources, aswell as chests, furnaces, etc.
You can lock your StorageDrawer with a key.
Creepers will try to breach the walls of your base.
Use night-vision googles to see in the dark.
Use a grappling hook to move quickly between tall buildings.
Use a parachute or crafteable paraglider to descend to the ground safely.
Use a backpack to carry more items around.
Right-click with your hook to attach to blocks, swing with WASD or reel by holding SHIFT+W/S.
Use a grappling hook table to upgrade your grappling hook.
Paragliders will slow your fall while in hand.
Parachutes need to be activated with right click, to detach press SHIFT.
Parachutes will only work once.
While paragliding or parachuting, press CTRL to move faster.
Break a placed backpack while holding SHIFT in order to equip it.
Place down equiped backpacks by right-clicking with an empty hand on a block.
Find or craft air-drop remotes to call in air support.
Find bounty-posts on villages to complete missions and earn rewards.