I can give you the basics advises:
don't keep your cryptos in an exchange - buy a cold storage wallet (I have a Ledger nano s but there are others) as they say if you dont own the privet key do dont actualy own the coins you think that you have.
the coins i keep in my wallet are the ones i don't intend to sell in the short run :bitcoin litecoin monero dash my steem are in my steemit account
i speculate with many other coins (buying up to 0.1 bitcoin) that as soon as i see 30% 40% gain or more - i sell but most of my money is in the coins above.
don't invest money that you cannot afford to lose
good luck bro
:)