Some links are to Amazon check-out pages : you think you are clicking on a link expecting to see a page explaining what a electrical-doodad is, but if you do it takes you to the Amazon check-out page to buy a that doodad , if you have an Amazon account it would be very easy to buy doodad by accident..
If not scam then sharp-practice.
If Amazon links are necessary [ to earn commission on sales] they should to be to the product-description page, not the check-out page.
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Basic Electronics Tutorials and Revision is a free online Electronics Tutorials Resource for Beginners and Beyond on all aspects of Basic Electronics