You will encounter many threats while playing The Front, including beasts and other players. A solid base, adequate supplies, and advanced weapons are the keys to survival. As your character levels up, you will be able to unlock more advanced tech blueprints in the tech interface (O key). At present, there are seven major tech trees, namely: Basic, Weapons, Structures, Vehicles, Gear, Supplies, and Technology. Unlocking some tech will require spending Ether Shards in addition to leveling up. Some tech will also have different conditions that you need to satisfy before you can unlock them.
Crafting from your Inventory
Basic tech can be crafted from your inventory (Tab key) in the early stages of the game once you've unlocked them. When unlocking tech from the tech menu (O key), make sure that the tech you want to unlock does not require a specific workbench to be crafted. Anything else can be crafted from your inventory.
Crafting from a Workbench
Most of the technology in the game needs to be crafted at workbenches. There are many kinds of workbenches in The Front, including Crafting Tables, Chemist's Benches, Metal Processors, Forging Tables, and more. Each workbench can only craft certain types of items. You can mouse over tech in the tech tree to see which workbench is required to craft the tech, if any.