crypto currency investing, anyone?

evening fellows


i was chatting with some friends and the topic of crypto currency came up
i figured i had a little bit of money in the bank i could invest so i did that

i got to tell you, this aint for me, to volatile, i feel like im on a roller coaster



anyone got any tips for me?

for instance how to read the stinking chart?
it might say

MOPAR $7.34
+3.41

BUT from when does it count the +3.41 ?

i got a few stocks that read positive, but the value is LESS then i bought it for
and i got a few that are negative but they are worth MORE


oh, and how long do you usually hold stocks before switching them out ?