Best credit card to use for building credit(details)?

More specifically I plan on using my tax return to build my first computer. I plan to make it a gaming computer and I was told if you DIY you could a lot more bang for your buck versus buying a pre-built one.

Basically I have about 1,200 dollars to play with. My plan was to simply buy the parts cash flat out through Amazon, Newegg, and similar websites.

But figured maybe I could spread the payments out a bit, build some credit.

Currently looking at the Amazon store card. It has a 12 month plan (purchases totaling $599 or more) where you pay no interest IF YOU pay off the full amount before 12 months. I’ll read it again to be sure, but that is how I understand it.

This was my current plan. I am however not well versed with credit cards so I know very little. Suggestions? Good plan? Bad plan?

Link if interested – https://www.amazon.com/gp/cobrandcard/marketing.html/ref=storecard_van?pr=conplcc