The good news - after death, the character will immediately appear at your base again, the base itself, blueprints, buildings, the level and skills of your survivor are not affected by death, the game continues!
Now it’s time for some bad news - after decease, the character's inventory will be empty. You can try to return to the place of death and, if there’s a corpse there (unfortunately, this does not always happen, hungry zombies and wild animals are always on the move!), take back your belongings. In doing so, you take risks, because the corpse may no longer be present, or your character may even die a second time.
In all these cases, well ... resources are lost forever. But accepting the loss doesn't mean to be desperate, sometimes it’s much easier to find new items, especially since the game has a lot of opportunities to do this! :)