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?
What you need right now is a video tutorial and some guides, check youtube for some brief videos and this forum for some tutorial guides, make use of the forum search bar to make enquiries about trading guides, you will have some self-explanatory threads that will help you out but at the same time you should NOTE: That the videos and material you watch and read are just for learning purpose, that doesn't really mean you may encounter similar trades, the market changes with the trend, you should use them as starter kits and improve your trading.
There is a tip I want to share with you, real traders learn during the bear market and that is what you should master now, when the bull run comes, you wouldn't stress much about trading, most often than not, you will always have a long position open with lots of profits because after all-time high, the candles that come are always wild and massive due to FOMO and that's when you make lots of profits.