need guidance plz

With 200$ you could invest in some cheaper altcoins to start with. Find some coins you are interested in on coinmarketcap, do a proper research on it and only then consider it.
Do not follow anyones blind calls, they are mostly just promoting the coins they own. If you have found a coin you like and you think it is worth your money, check which exchanges can it be traded on (coinmarketcap will help you with this too). Good luck!