Recently I have been trying to come up with ways of making some money on the side and thinking of giving trading a go.
I have zero experience and have just been looking on Coinbase at the best and worst performers of the day.
I am thinking of buying coins that are 15% or more down and then selling once they pump 10% and move onto the next one that is 15% down and then again sell at 10% profit and just keep repeating.
Anyone done something similar or will it just lead me to losing my money?
There's this saying that "experience is the best teacher". You can not have zero experience and attempt to risk your resources on trading. Trading is an aspect of crypto that requires experience fundamentally and technically. It is some how difficult to understand per say that not everyone will sustain in it with amateur knowledge.
Talking about making money, I don't think this is the right step for you unless you can be patient enough because some coins will take forever without increasing a decent cent. The percentage is not as you're thinking by the way. Forex trading might be better than what you are planning above.
You can not succeed in trading with mere self trial. Get your self a mentor, watch video tutorials, read and then practice. People with a experience are losing sometimes, imagine yourself without experience. You'll lose enough.