you are telling the truth. Many people don't know the basic thing.
they are lower than me a newbie .
who can get so much coins?

I do not understand again..
Are you an idiot? Why the hell are you using crypto currency if you don't even know what a change address is.
If for example, I have 1000 coins, and I send 1 coin to you, there is a chance that the rest of 999 coins will be transferred back to me, but in a change address, a different address and it will appear in the block explorer as a transaction of 999 coins.