Im newbies

someone know how to do this? i read comment he say “create a plane (in edit moder Alt +M -> centrer). Activate magnite + vertex +closest. Extrude dot .” but i confuse because i newbie (sorry my bad english)

Hello @Thaqif - try this:
if you just want to make a new face
select the 4 vertex of the new face
then hit F to make face

you can also select the 2 long edges of the face
then hit F