Questions about binance

https://www.binance.com/en/event/affiliate_bonus_campaign

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1. What is meant by "first time fiat or p2p deposit mean"? I give them USD and they give me crypto and I get 5$? This is worth it even after fees? Even if I put in only like 0.01$?
2. "Make a first time cyrpto deposit of >=50 USD within 5 days" -> so if I buy 50 USD of GUSD from gemini and then send it to binance, I get 50$?
3. For the 45 spot cashback, "first time cyrpto trade of $100 on Spot" -> Is there some kind of way to meet this condition with only stablecoins? I don't really want to touch bitcoin, just want to get stablecoins. What is a trade?
4. If I'm new to cyprot, how much money should I be ready to spend to get this 100$ bonus?