Is it smart to use leverage on a longer position? And should I stick with spot?

I’m currently investing a lot of time and trying to learn how to swing trade BTC (mainly).

I asked myself if it is smart to use leverage on a long position? The timeframe I’m trading in is between a week and let’s say 2 months when opening and closing a position.

And my second question is if it is smarter to trade BTC futures or stick with spot/margin BTC/USD?

Thank you!