monitor

i would rather spend this money on english course in your case

Cheap option for 144hz
Suffers from image ghosting
Can't change height of the monitor which sucks
Does not have displayport
Decent picture quality

benq xl2411z

i own an Acer Predator GN246HLBbid 144Hz myself and the picture is that bright as by far no monitor i own before, it took me some time so set it in a useable adjustment (set brightnes to 0 in monitor menue and nvidia collor settings), otherwise the sun is litterally shining if you open a word document or something else, games and videos are much to bright aswell....
would not recommend or buy again, but i do live with it and in some cases it can be a pro o own a second sun - forget r_gamma ;)

I would recommend ASUS as I put a lot of trust in this mark. With specification of:

Basic:
Time Reaction: 1ms
Frequency Refresh Rate: 144hz
Matrix: TN (most cases for cheap gaming monitors)
Max-Resolution: 1920x1080

Optional: (higher budget)
Time Reaction: 1ms
Frequency Refresh Rate: 144 or higher
HW V-Sync: G-sync or FreeSync (for other mark)
Matrix: TN / IPS (better color quality and contrast, higher view angle) / IPS Curved (gaming maniac or lottery winner)
Max-Resolution: 1920x1080 or higher

For cheap price You will get only parameters of 144hz + 1ms + TN, which are in my opinion necessary for gaming, e.g.:
- ASUS VG248QE [1ms, 144Hz]
- ASUS MG248Q [1ms, 144Hz, 3D]

Otherwise if you are annoyed by Screen Tearing and willing to spend more money I would recommend G-sync/FreeSync + 144hz + 1ms + TN, eg:
- ASUS PG248Q
- ASUS ROG PG278Q [1ms, 144Hz, G-Sync]

If you have high budget You can try G-sync/FreeSync + 144hz + 1ms + IPS/IPS Curved.

Necessary plug-connector:
- DVI Dual-Link
or
- DP

Optional:
- HDMI (equal or higher than 1.4v; recommended 2.0; too much troubleshoting; I wouldn't bother about HDMI)

P.S. And yes, if You was thinking about Screen Tearing You are right, it's possible to use software V-sync, but it cost Respond-Time, You will get rid of Screen Tearing but then forget about 1ms RT. If you don't, then hardware G-sync/FreeSync is required.

https://www.scan.co.uk/products/24-asus-rog-mg248q-tn-panel-amd-freesync-1920x1080-1ms-2x2w-stereo-speakers-35mm-audio-out-dp-hdmi-d
I've this one for 2 months now it's a good one! :)