I have completely stopped buying from Amazon buuuuuut I still use them.
Use them to find the products you want. They have a good search engine and lots of reviews of products. Use https://www.fakespot.com/ to make sure the reviews are good! Once you find the thing you want, look up the company and buy from them. Most places have free shipping for things over a certain amount. I’m in the USA so I’m no sure if this would be the same for you. But, you can use a search engine to find it at a more local store.
Kindle is still my favorite eReader but I don’t buy them from Amazon. Calibre is a good program that can change file types of ebooks. If you buy an ebook from anywhere else, you can convert the file to epub. Then you can email the file to your kindle library. It will add it and keep all functionality as if you bought it on kindle.
The main issue with any computer is that they can’t adapt to new situations. We can infer and work through new problems. The more variables the more “new” problems. The problem with biology is there isn’t really any hard set rules, there are almost always exceptions. The amount of functional memory and computing power is ridiculous for a computer. Driving works mostly because there are straightforward rules.