Welcome, and your English seems fine to me.
At 16, my best advice is to first put together what we call a BOB (Bug Out Bag) or GHB (Get Home Bag) and have it with you at all times (or at least close at hand, like in a vehicle, etc.). There are LOTS of threads here on what to put in one, but basically:
WATER - ways to store it, purify it, boil it, etc.
FOOD - food you can eat without cooking, and/or that will last a long time, provide good calories, etc.
FIRE - matches, lighter, sparkers, etc.
DEFENSE - firearm, knife, etc.
FIRST AID - small first aid kit, some kind of anti-bacterial, any needed meds
SHELTER - tarp, poncho, ways to make heat (if in a cold season), cord to help fasten a shelter
Anything else is just for fun.