- Spot Trading--> In this, you buy BTC at price "X" and sell at Price "Y" with covering some profit and loss. If you are new and have a lesser amount even then I can say giving it a try is best because future trading and margin trading is the trickier I personally fall prey to these trading types, and lost money How? I was lacking Knowledge of Technical and General Analysis.
- Margin Trading: You borrow money from the exchange with average and at some liquidation price, if the token you had invested in goes below that point (in Long) then you will lose all of your money and vice versa. depending on your money this is the best option as with 100$ you can borrow 100 more and can earn more but that also doubled the risk of even losing your money too.
long term means holding for a few years maybe months, and short-term means holding for weeks to months. Like you invested your $100 in BTC and wait for a few weeks or months until you make a profit.
Once you knew which type of trading suits you best depending on your experience, You can start. And yes you can buy BTC for $100 all at once but i prefer you to do DCA (Dollar Cost Averaging) in which you put little segments of your investment capital whenever you got an entry point this will increase your profit ratio.
Yes, $100 is more than enough to start trading, let me tell you a short story of my friend's journey, He started from $7 in future trading and made $150 out of it but unfortunately, he lost $50 in liquidation. but he earned above $93. But a reminder he has a good experience as he lost too. when I see him I also start future trading and lost everything even my own. So I came back to Spot trading because in this if I buy btc it is my own it does not matter if the price goes up or goes down if I have 0.2 btc they will be 0.2 forever, But in future once the price crosses the liquidation price your money is gone.