Last 2 days I bought for about some cheap coins and it went down for about 5% or something and I decided to sell. And now, I am at full regret that all of those coins are now up for about 20%. My lesson for that is to be patient since the market was down for some day and it will always go back up.
no, actually your lesson was something entirely different but you misinterpreted it!!!
your lesson is that next time you need to act much faster and never let things go by without paying close attention to the market. trading altcoins is not something you can do half-assed. it needs dedication and spending a lot of time.
for example in this case you bought and prices fell, you sold at 5% loss which is a very good decision because it is a nice stop loss and a wise move.
then things changed all of a sudden and prices started to move. now your mistake is here. your mistake was not buying back when you saw the reversal. what you needed to do was to buy back on the way up (assuming you are right about the 20% rise) and then enjoy part of that rise like 15% or 10% of it and dump on top to get that profit out.
