What resulution latptop i should buy 4k, FHD or HD?

I am planning to buy

HP Laptop with
i5-7200U 7th Gen or i7-7500U 7th Gen
DDR4 8 to 16 GB RAM
Windows OS

And my requirement is
Watching Movies through internet
Running some oracle applications
(Not playing any games)

Please suggest me, because i have heard that buying 4k may be problematic but not sure

Read more: What resulution latptop i should buy 4k, FHD or HD?