trading will works when in one market can be found a Buyer and a Seller,
so,it works like a traditional market when a seller sell their items and buyer buy the seller items.
trading divided into many parts,and many people divide it into 3 which is :
Short,Mid,and Long.
Short-Can be say day trade or something like that [Day trade is an activity to buy or sell in a day,that's why it called day trade]
Mid - Take a month or more to do a trade,
Long - usually people describe it when they do a trade for more than 6 Months,
many people get a lot profit when they're using Long part,
in my opinion,if you're new in trading you can not do a short part because it's very risky and more likely you will lose your money.
do not every believe what people say and do a research before entering,
Buy on rumour and sell on news < which mean when you heard ther'll be something huge in the coming week or days more likely that coin will get pumped a day or a few days before that news.and huge dump will happen when that news come up.
in cryptocurrency you'll lose it if you sell it cheap,keep holding it if it's not a scam project or fail project,
and you will gain a profit in the future
This sums it up and in general it is just exchanging your coin to another coin with higher price. You can always trade btc to other altcoin or in vice versa. Or the main point here is wait for time until the price goes up. The most profitable from what i see is the long term but you have to know the coin you had invested in. Also if you are new you really have to sacrifice some money. The faster you adapt the faster you get wealthy.