Buy bitcoin, that's the safest and most secured coin you can invest right now. Make it a habit also to read and research about the coins you want to invest in, of course people would want to ask opinion on others but at the end of the day it is still you who decides which coin to invest in, right?
I agree with you, bitcoin is the safest option but you can also invest in some alts for good returns. But first research thoroughly about the alt you want to invest in.