inary addition is easy, just remember that adding 0 and 1 gives always 1 but adding 1 an 1 gives you 0 plus 1 which must be added to the higher binary position, so: 1+1=10, 1010+10=1100 , etc
You do not have to pay much attention to this, if you make several exercises in the window above you certainly master binary addition quickly.
Enjoy !
Witold W.