During the main quest “The Point of the Spear”, you’ll have some sort of freedom before abiding to Rost’s instructions to meet up by the northern gate. I suggest using this time to get used to the game by freely roaming in the Embrace. The machines in this location are weak but will put up a considerable amount of threat at your current level so getting used to the combat system, earning some extra shards (currency in the game) through hunting machines, and experience should be a good start. These are entirely optional and you can do these later if you want.
Return to the Ruins where Aloy fell as a child. With the spear, you can now destroy the stalactites and stalagmites blocking the path to some rooms. Some of these rooms have supply crates that will give you a good amount of resources but the most valuable items you’ll find inside are the following:
Errand:
Sidequests: