i dont have trading strategy,its why last week i loss when trade etherum

maybe i lost the point that when i'm try to trade altcoins i must looking for information about the price,but last week i didn't do that.
if you do not have a strategy, at least you have a chat group or some friends who have the expertise to analyze and you can follow their trading. I also usually do this, when I am confused in choosing coins.
To have a good strategy you must be patience otherwise you are going to lose money fast and that is bad, so you need first not to make any profit.
And just build it up later so you can also make more money later in the future when you have more skill.
I would definitely do the same which is buy bitcoin when the price is very low and cheap then after wait for the desired amount or high value of bitcoin then you will be able to sell for your preferred amount. This is for me a good strategy