So it just like the normal trading but using Bitcoin
But, does it safe?
Yes, It's the same, you can buy bitcoin at lower price and sell when the price becomes higher or You can also use your bitcoin to buy altcoins and do the same.
What do you mean,"is it safe"? the risk of trades are always there.
I ask that question because I never do trading before
Unleveraged it is quite volatile, but not crazy, anyone can trade bitcoin and won't get wiped out, but you will experience swings in price that might annoy you when it goes against you.
Leveraged bitcoin trading is lunacy in my opinion. I think 200x is possible, but a single whale deciding to dump onto the market could bankrupt you, and I don't mean your Bitcoin balance, I mean really leave you bankrupt.
Stick to unleveraged trading and you can't go too far wrong, just don't risk more than you can afford to lose.