Short selling involves
Borrowing a block of shares, or some other investment, from somebody
Waiting a little while
Buying it back again
Giving it back to the person it was borrowed from.
The short seller hopes that it will go down in value between when they sell it and when they buy it back. If they are right, they make a profit. If not, they ...
In an app such as cash app. I can invest at minimum $1.00 into any of the companies made available. Example: Tesla is trading at around $430 per share right now. I bought $30 of a share in $5 increments ( I was new at this and added $5 more every few days until I had $30) which is roughly %0.073 of the share. Letting it grow, I've gained $2.32. Not much ...