The "scanned" image is my general idea, basically a product research (when you're finding the right product to buy) assistant that does the work for you.
The really important feature that might be a bit complicated is automatically finding suitable sections of reviews like this from TechRadar
For now I'm mostly going to start with laptops, as that's the problem that inspired the idea, but in the future, I might explore a general algorithm for different types of products. Also, for the price research part, I'm probably first just going to compare listings within Amazon, as I believe Amazon has an API for such comparing.
I will probably practice JavaScript or Python, as it will probably be a webapp. I will get quite a bit of experience with web crawling/aggregating for the comparison stuff, as well as searching databases. One goal is ranking a few top products, including that match most, but not all specifications wanted, so I'll need to write some ranking & comparison algorithms. I will likely have to learn Natural Language Processing(machine learning) for the "stand-out" feature, for identifying relevant sections of review pages/blog posts.