2:50 you can speed up this process with the F2 plugin. you only need to select one edge and press f to create a face. you can create a face loop by just mashing f!!!!! it's very handy, used a lot in retopology.
Thank you so much! I didn't know F2 plugin, I'm trying it now and so surprised! yes, my middle finger is going to be broken, thanks to your advice so much!