Ok, could you tell me about the durability of these laptops? An engineer told me that hp low end models like these ones tend to break down after a while and that laptops with integrated GPUs also tend to overheat and break down within a short time. He told me that across brands low end lenovo laptops have the best durability. Any thoughts on this?
At the price point you're looking at, all of them will have low durability. Here's a little secret - the "laptop manufacturers" don't actually make the laptops. They're made by companies called ODMs - they're like an OEM, except they also design the product. The brand name just slaps their label onto it and sells it to you. Even Apple's laptops are made by an ODM called Quanta (who also happens to make most of HP's laptops).
Most laptop brands use multiple ODMs, so it's impossible to tell just by the brand name how good the laptop's quality will be. One model may be very good quality (made by a good ODM), while another model may start falling apart in a few months (made by a poor ODM). Even though they're sold by the same brand. About the only thing the brand name tells you is how good your warranty service will be. At your price point, I'm guessing all the laptops are made by Wistron (former manufacturing arm for Acer - famed for their cheap prices and low build quality). But that's a guess.