simplest bed test

thingiverse

if you can print this, then you should have no problem with starting layers of any print, minimal filament waste. Scale Z height to match your printers layer height scale x,y to match the area that your print will cover if one angle/side has issues than that points towards the direction of the screw(s) that needs to be adjusted, if the center circle has an issue the bed is warped and to far from print head(raise bed)