So a few things with the build you linked.
The motherboard is a ASRock B250 Pro 4, which doesn't support overclocking at all. If you had plans to overclock, you are out of luck with it.
The CPU they have in there isn't bad at all, being the i5-7500. The i5 does have better clock speed and single-core speed; however, the Ryzen 5 1600 that 13 linked completely blows the i5 away with multi-core speeds and paired with the fact that it's a 6 core CPU, it will fair better for your video editing you mentioned. What also baffles me, is they mention "Turbo Boost Speed: Up to 3.8GHz" yet they throw in a motherboard that won't allow you to OC at all and even then, the i5-7500 isn't known for it's OC speeds, since it's max multiplier for OC'ing is only 38 x 100Mhz or something like that.
Storage is a little nitpick for me, but they didn't mention which brands for the HDD or SSD. They mentioned the storage amount and the RPM on the HDD which is a plus, but without the brands, you could be getting some cheaply made storage.
GPU, which I was right, is the reference cooler. They listed NVIDIA GeForce GTX 1060, which is a reference cooler instead of open air cooler. Now does this mean the GPU is shit? No. It simply means that is will get hotter quicker, which will make your game start to have stutters as it'll eventually throttle speeds to keep itself from reaching a dangerous temperature. Of course your cooling in the case and overall ambient temperature matters too, but it'll still reach the throttle threshold faster than an open air cooler would. The reference cooler would be fantastic if you were to watercool your GPU, but since you're not, an open air cooler would be much more suited for temps.
Keyboard and mouse they included with it is probably some Dell or HP, mouse & keyboard combo. I know you only need a keyboard, so a mechanical keyboard would be the better suit for you.
PSU is what really bothers me as every pre-built PC has the same issue. They either don't even bother to mention the PSU at all or they're very vague about it, like this one is. "Power Supply: 500 Watt" ...doesn't mention the brand, model/make or rating such bronze, gold, ect. That is a grey area that would make me feel sketchy about, because all it takes is one shit PSU to kill your whole system.
This isn't too big a concern, but I just hate these designs as it doesn't let fans use their full potential. So the case is well ventilated like you said you need for the summer, however it's too
ventilated. I know that sounds arbitrary, but it is. For one, the case is literally just holes with nothing to cover it. That is a dust build up waiting to happen, which forces you to clean your PC more often than others. Yes it will provide more cooling but once the dust builds up, it's going to get hotter than ever before. On the left side panel, there is two fan mounts, which, you either face to blow air onto your hardware, but also blow more dust on them or have them push air out, which at that point kind of defeats the purpose of the front fans as you want the air to force their way out, instead of just being sucked out. If things worked that way, there would be no point in having a side panel other than to protect your hardware. Then we get into the talk of too much negative or too much positive air pressure. Seeing how the whole front panel is just holes, paired with the top, side panel, back and of course any other small gaps, there is going to be too much air to escape. The idea of fans is to have air trapped in the case and find it's way out through force so it has room to cycle through and cool what components it can. This case design nullifies that. It's great for letting air in, but it's also great for letting air out too quickly. This goes back to the thing with the side panel I mentioned. A lot of people think keeping the side panel off is great for cooling, it is, but not like they think. If they're doing a benchmark and want to test with the ambient temperature, then that's what they need; however, keeping the panel off, allows air to be pushed into the case and immediately sucked right out the side, cooling very little on the way. What you typically want is less exhaust fans than you want intake fans.
So for this case, we'll be using an example of how things should be going; we'll just tape over all the holes on the front panel near the optical drives (DVD and such.) You would want 2 fans in the front, one on the bottom on the inside of your case and both fans on the side panel pulling air into your PC. The fan at the back and 2 on the top would be pushing air out. What that does, is it forces air to come in through the front of the case, the side panel and from the bottom, the will try to escape from what it can but there is very little for it to escape from. The fan at the bottom pushes the air up, where there is cools at a higher level too, while still trying to escape, now it's reaching where the fans can push it out which it's supposed to do. The air was forced to move upwards from the bottom fan to find where it can escape. Now we take the tape off all the holes on the case that are there by poor design and that air is free to escape and low-mid level, only really cooling your GPU and some of the motherboard, ignoring the RAM and helping somewhat your CPU cooler out (this wouldn't matter too much for AIO, instead the top fans would focus on the radiator.) So this is the problem with that type of case design, it really doesn't allow fans to their full potential due to them offsetting the air pressure. The case 13 linked is optimal. Tempered glass for air tight seal on the side panel, plus just looks nicer (be careful with it though, it is glass, but tempered glass shatters like a fine powder should your break it.) On the very front of the case near the top, there is a few vent holes, which again, is great since it's at the very top. Looking inside as best I can from the image, looks like it supports 2 140mm fans. No clue what the front panel is like, but I'm positive you can mount 2 fans in the front to create their own air to push inside the case.
Long reply, my bad lol.
Anyways, the build 13 linked you is far better off. You get a CPU that can overclock, has more cores for your editing. A motherboard that allows you to overclock. A GPU that is an open air cooler. A case that looks better and actually allows the fans to preform how they should. PSU with it's rating and a decent one at that. Mechanical keyboard is always nice too. Plus he leaves you room for a monitor. You can get an OS, such as Windows 10 keys for like $15-$30 on Kinguin, maybe G2A or head over to [ Register or Signin to view external links. ]
and see if anyone is selling an OS key or CD for cheap. Just read the rules there to make sure the transaction goes well for you, even if you have to ask if anyone is selling a key for you. If you need, I might have a Windows 8.1 CD lying around I could upload and send it to you, so you can create a bootable USB and use that to install. I have it installed on another PC, so don't know if the product key will overwrite mine, but you don't need the product key for Windows 8.1 if you're upgrading to Windows 10 anyways.