Hi folks, I am new to cryptos and this forum, please don't crucify me.

I had a few questions if you could please give me some insight.
With so many altcoins and high volatility/uncertainty, do you keep your coins in the exchange you bought them just in case you need to sell them quickly and for convenience?
I am using Binance at the moment (graduated from Coinbase/Gdax).
If you store in your PC wallet or any other type and you need to sell quickly, you can lose a lot of money if there is any glitch or delay when transferring back to the exchange, so I was wondering about this.
Also, how do yo know who to trust when you see someone talking favorably about a particular coin?
It looks to me that everyone and their mother are pumping to then dump without telling anyone so they can maximize profits, so can you even trust those groups I have read you guys follow?
Any suggestions for a reliable group to follow?
Thanks a lot.
There are a few post about this topic, but there does not seem to be an answer because you can get hacked, and exchange can get hacked or even the owners may say it has been hacked to take all the coins and as you said you might need to sell in a hurry and find a collapsed network. So no easy answer. As a rule, I try to work with different exchanges and also have several wallets.