I'll start - I don't shop a lot, but if I had to buy stuff like hardware parts, I do use Amazon sometimes, but if I can, then I try to use Flipkart. Realizing how it has turned into a monopoly, I try to look for alternative websites, and check if they're trustworthy.
If I remember correctly, the last three items I've bought online were hardware parts from some local websites. The chi-fi IEMs were bought through headphonezone.in, and they were super-fast in delivery - I had to wait for only four days.
I avoid it basically wherever possible, but sometimes people give me Amazon giftcards.
I don't buy a huge amount of stuff off the internet, transacting in person is often more convenient. Imo Banggood, Aliexpress, dhgate, taobao, etc. are often some of the best alternatives, because a lot of Amazon is just selling that same stuff, but for more money.