Amazon handles the transaction & doesn’t give your cc info to the seller— which is why I prefer Amazon rather than 1000s of individual online retailers who’ll have your cc info long after you’ve made that one purchase.
Amazon also has a PayPal option. If you just get a PayPal account, you can use that on Amazon & 1000s of other sites, with only PayPal knowing your cc number.
It’s best not to use debit cards— hackers could drain your bank acct.
I have found that many things that I can buy in the local department store can be found a LOT cheaper on Amazon, with no reduction in quality.
Last year I bought a particular item of female clothing for over $40 each. Style and fit were perfect for me, so I looked online for more, and found that on Amazon they were less than half the price that I had previously paid.
This certainly won’t happen for everything you want to buy; but it’s very useful if you are used to a particular item and can’t find it anymore in the stores. I assume some people overstock, and when new styles come along they sell the old surplus online. Lots of good deals to be had.