1) If you were to recommend a platform which one and why.
Binance
FTX
Kucoin
They're the good ones IMO. But I'm using binance among them all since it's easier for me and I've been doing most of my trades there.
2) If I was to stake my 1 bit coin what would I get in return as a passive income.
It's not really staking but you're lending it to the platform like an interest account like in nexo, binance and other platforms. They usually have
a fix calculation for the interest rate that you'll earn yearly.
But I don't advise to stake in any of them because, if it's not your keys, not your coins.
3) Can you recommend a good youtube to watch for advice on investing.
It's better to just keep up with the discussion in here rather than watching any video about investing in Youtube especially investing in crypto. They'll just shill you with the projects that they have been holding.