hello guys. Anyone has knowledge on the best way to differenciate a Buy from a Sell if I use uniswap? trying to call two different functions, one on sell and one on buy

You have to be more specific. A buy is always also a sell, it just depends on the point of view. Also, are you looking from inside the token or how are you observing this? If inside the token, then I don't think you can differentiate as the token has no idea what is it being bought/sold against

Hey thanks for your answer. A buy/Sell to the point of view of the person using Uniswap. And I think it'd be easier to look from inside the token contract, if that's something I can do

As I said, you can't see it from inside the token contract since the token contract only sees that the token is being transferred - it doesn't even know that some other asset is transferred at the same time.
So you probably need to monitor Uniswap emitted events and consider for example that if there is a swap of asset A to asset B, you have to decide whether to consider that as a buy or a sell.

I see awesome. How do I monitor Uniswap emitted events? Do I need to import the Router Interface and then the router functions to modify them from inside my own contract?

no, this has nothing to do with Solidity. you can't do this on-chain. here's some random article which was the first google hit: https://www.pauric.blog/How-to-Query-and-Monitor-Ethereum-Contract-Events-with-Web3/

Thanks i'll read

It's often best to have as small contracts as possible, to avoid bugs