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! 
Because of the big update of bitcoin its better to wait on the completion of the update. There are many advising here and was also what I do that we need only trade bitcoin after august 1. In about ethereum, you should trade now because its ok.To avoid the disadvantage may wait until the end of segwit is the best choice. You will not experience loss of course by doing this action.
Unfortunately the price downfall for those past days around and that time is the perfect time to invest on bitcoins since many people earned by now for adopting and buying at those downfall rate, But for now we cannot tell if this time is the best time to invest since the august 1 fear is not occuring and might we gonna get a best shot if we could wait for another huge oppurtunities of dump arive so better we need to have an eye for seeing the hourly stats of btc if we want to invest today.