There is a good reason why Amazon is the world's E-Commerce leader. If people didn't find it safe and reliable to do their shopping there, Amazon wouldn't have the rating and popularity it currently enjoys.
Amazon puts a lot of effort into giving customers a secure shopping experience by awarding good merchants with higher rating and those who disappoint - lower rating (Amazon Seller Rating).
Knowing how the Amazon Seller Rating measure works, it's easier for online shoppers to make confident decisions who they buy from.
In relation to your specific question about electronics, the same rule applies. Buying electronics from Amazon is as safe as it can get. The only difference you can see from other online stores is the price. There is various research across the web saying that you can often get a better deal on electronics elsewhere.
As for safety and reliability on Amazon - this is something they strive very hard to achieve, which makes their site probably the safest one to shop from.
Hope this helps, have fun shopping!
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