01:15 - adding grids
03:10 - draw coordinates and provide specific coordinate reference systems (CRS)
06:10 - small overview of CRS geographic systems
08:30 - the interval of 1° in geographic CRS, how many km is it?
12:00 - what is a frame? 
12:55 - degree and minute => NB in the video it is not mentioned, but it is better to user the "ALIGNED" version of degree, minute or degree, minute, seconds - ALIGNED means that 11°0'1" will be printed as 11°00'01" which is better looking.
15:30 - coordinate precision - how many digits after the decimal ?
17:10 - important... do not keep useless number of decimal digits 
18:00 - add secondary grid in another CRS
22:00 - old-fashioned paper maps grids