Wanting to build or buy a PC

As the title suggests I want to build or buy a PC but I’m wanting to start with a Monitor and I know nothing about what specs anything should have. The Monitor I’m looking at says it’s a Dell Curved Gaming Monitor (34”) and the specs are

Type: 34" Curved WQHD LED-Backlit LCD Monitor Features: LED edgelight system; Supports AMD FreeSync Premium Pro Technology at 144Hz refresh rate; Response time: 2ms (GtG) in Extreme Mode; 1ms (MPRT); 99% sRGB color gamut, Viewing Angles: 178-degrees horizontal/vertical Display: TFT active matrix; VA panel; WQHD 3440 x 1440 resolution (DisplayPort: 144 Hz, HDMI: 100 Hz); 21:9 aspect ratio; Brightness: 400 nits; Color Support: 16.7 million colors; Anti-glare 3H hardness screen coating

I appreciate any feedback anyone could give me