Trading is a very risky part while investing is you're always is a safe zone. Why? Because you can hold it depend on how long the time frame you want and the profit you have been targeted on it.
Not necessarily. You being in the sort of "safe zone" completely depends on what you're actually investing in. I mean, you could hold certain penny stocks for god knows how long and you could still end up in a huge loss.
Depends on the coin most of the time, but if coins like BTC and surely it is near the said "safe zone".
Trading is indeed quite broad of a topic as there's plenty of strategies and methodology on how to do it.
I've day traded before and it went quite unpleasant due to lack of my patience and probably high expectation that just because I move my coins around the market doesn't mean I am still earning some.