When you make a farm, right after clicking "new", before you even get to choose your appearance there's an option to enable tutorial hints. They teach you how to plant seeds - select the hoe, click on a tile of soil, select a seed packed, click on the hoed spot, select the watering can and do the same thing. They also explain most tabs in your inventory.
There is forage on the ground, usually outside the farm, in spring it looks like this:
, you can pick it up by walking up to it and clicking on it.
If you do the same thing to an NPC, you'll talk to them. If in that moment you have an item selected, you gift it and they react. The reaction varies based on the specific NPC and the item, but you will lose it regardless of that. Giving them the items they like is how you make friends.
If there's a white bubble above the mailbox, you can interact with it to read mail. To the right there's a box - its the shipping bin, anything you put there will be sold overnight and you automatically get the gold. Wouldn't recommend putting resourses like fiber, stone or sap there, try crafting a chest (inventory => crafting tab, the tutorial hints will explan it when you open it) and storing them there.
you can’t even play it is this some kind of scam
Nope, it is very playable and enjoyable once you figure out the mechanics. I think I covered most of the basic stuff, there's more, but I don't want to make this too long + how'd you remember a 3 page guide all at once. Ask here if you still can't do something.
Edit: remembered another thing - if you hold down on an item in your inventory, a description of it will show. If it says how much energy/health you can get from it, its edible. Tap on your character while holding it and confirm that you want to eat it.
So not necessary for me. Though they could most likely be useful for someone who's not played any farming game before.