How to survive , because it gets early already damn hard .. only can find the 1st trap .. pretty useless seeing it only heals once 10 hp
It really does get hard. The first few stages only have the first trap. My tip is that always plan ahead for an attack. As I mentioned above, do keep in mind what turn there will be an attack. You can switch out the goblins in your attack team, to use them as defenders, too. If you're not planning to go out and attack, you don't need to set an attack army, and vice versa.
The rituals options give you extra traps placement, but it's RNG so kinda difficult to get more traps in the early games.
Always have your best goblins, of the highest generations, to defend. If a battle is too hard, consider having special goblins (hobgoblin, champion, shaman) as pack units. Or better alternative are Wolf Riders and Meatshields. These are special tokens that drop on the adventurer's tower, from floor 21 and above.
But you don't really need to survive. This game is heavily based around New Game +, so losing is not too detrimental, you can (and should) start over with New Game+
Edit: Do read the pdf files that come with the game. They contain lots of useful information.