Convert XY coordinates to polygon in QGIS

Last week we shared the same contents using ArcMap, this week we thought about using a different software to achieve the same result.
Happy 20th anniversary to #QGIS

link to previous videos

[functional]

Thank you! this helped me generate shapes from CSV for my grid based random coordinate generation

[kathmanducity]

Thank you. I was able to generate polygons from vertices of watersheds.

[smurfk]

I have created a grid but how can I get the lat and lon? As I extract values to that grid points it clearly shows a grid box

[MrDrushkan]

how did you manage to enter coordinates in separet columns and load it? in my case in that way, everything is messedup. But if i write all in one row, and separet them with comma, then qgis load it like in your video.