Pandu

I would choose 2600. It will also leave you better options down the road. I use photoshop for work on my 2600x and haven't had any issues and I came from an I7. 

Go with ryzen 5 2600 it will be the best choice

2600 and upgrade in 5 months or later, or wait for 5 months before building.

It's hard to say. The 2600 when overclocked beats the i5 8400 in most workstation oriented tasks but Adobe supports quick sync which you need an Intel cpu to use.  

Totally don't matter if its a Pentium, they don't get very hot, they don't overclock - its only to get good thermal contact between the heatsink and the ihs
 
if you want a brand name, then the best cheapest well respected paste on amazon as far as i can see is this - arctic silver 5

Not like they're super expensive, grab a NT-H1 lmao
https://www.amazon.com/Noctua-NT-H1-Thermal-Compound-Retail/dp/B002CQU14A/ref=sr_1_1?ie=UTF8&qid=1522489332&sr=8-1&keywords=noctua+nt-h1

I'd say the Samsung. Sony uses IPS panels on their lower lines, which results in very shallow blacks and poor uniformity.

Looking at the talking points for each device (reviewing online stores), i feel that Samsung model has more useful features and if you have a Samsung phone it can be even more feature rich. Business rumors also showed that Sony maybe looking to Sell of their TV business.. I'm no blogger/business following person, this is just my opinion, out of the 2 options, i'd go Samsung. 

I'm gonna guess LG Display. Which is a company from LG that manufactures displays "only" (unsure about only) for other companies.
But I might be wrong.

Then ya check out the TCL stuff, nearly half the price at that size

https://www.amazon.in/109-3-inches-L43P2US-Smart-Golden/dp/B06WRNHRPM/ref=sr_1_1?s=electronics&ie=UTF8&qid=1517726787&sr=1-1&keywords=TCL+4k

As a OP fan, the 5t  

Anything with less bloat so the 5T! :3

I've ordered an OnePlus 5T two days ago, still waiting for it to be delivered, but my dad has an A8 2018, so I might be able to give you a good real life comparison once I have my 5T.

If you are talking about thermal throttling...no you shouldn't. 

If you buy a retail model, then yes it will come with a stock Intel cooler.

For future reference, at the moment, only the higher tier unlocked processors (which I think is just the i5-8600K and i7-8700K) and the high-end desktop processors (the X chipset motherboards) don't come with a cooler. Everything else does.
 
As a quick and dirty spot check, if the box is more cubed than flat, it has a cooler. Example:
Does not come with a cooler: https://www.newegg.com/Product/Product.aspx?Item=N82E16819117825 Comes with a cooler: https://www.newegg.com/Product/Product.aspx?Item=N82E16819117822

If it is the box version, yes it will but if it is tray, no. And for the second question just search lga 1151 and sort it by cheapest.

Yes it comes with the Intel Stock Cooler.