To craft, you can press 'E' on your keyboard in PC, or you can press the three white dots next to your hot-bar to open your inventory. Then, you will see a 2*2 grid, on the top right corner. You can craft basic stuff from this grid, such as:
4 torches:[]
| coal | |
| stick |
1 crafting table[]
| wooden plank | wooden plank |
| wooden plank | wooden plank |
1 Wooden Sword[]
| wooden plank |
|---|
| wooden plank |
| stick |