Newbie here and I want to start trading soon. Just want to get tips on when to invest on btc and eth. thanks in advance! 
Probably when you money to invest in, if you have that coin you can invest in that anytime. But kidding aside, on investing on bitcoins everyday is a bitcoin day so invest in bitcoins as soon as possible because the value of it always rises. And just find a high potential project to invest in to gain more money or to gain more profit than just holding your coins and waiting to pump.