75hz is pretty much the entry level standard these days compared to the old 60hz standard.
100hz is a little better, but I would guess this is just an overclocked 75hz monitor and may not have the best characteristics.
FreeSync is a type of anti-tearing mitigation. It puts the GPU in control of the monitor's refresh rate directly so that each full frame is displayed in a full frame on the monitor and will match your Monitor refresh rate to your frame rate. FreeSync is AMD's version of this technology.
If you have a recent AMD GPU (RX) with an HDMI port this should work. If you have a recent GTX or RTX card the monitor will need to have displayport to maybe enable G-sync compatible mode, no guarantees there.
FreeSync isn't mandatory, if you are used to V-sync, every monitor has that. Basically only draws a frame when the monitor refresh rate cycle happens. Means higher latency in general and can be counter productive if your system can't handle the FPS/Hz required. Or you can run with nothing which means the video buffer gets dumped to the monitor directly. When your FPS and Refresh rate don't come close to matching you will see multiple frames on the screen in say the top and bottom half or persistent lines where one frame starts and another ends.
@geofelt the very low end monitors don't get much in the way of press, and these are the designs that tend to have the shortest lifespans as part availability and cost cutting means new revisions constantly. Almost none of the monitors rtings.com reviewed fall in the price category here.
My knowledge of many of those brands on offer is lacking too. Some of the Asia market brands often make use of decent hardware, but I wouldn't trust that much in the lower price category.
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