BMQ (Basic Military Qualification) teaches the fundamentals such as drill, CF structure, and the service rifle to name a few of the things you would do. It doesn‘t get into any of the actual field manaeuvers yet.
SQ (Soldier Qualification) teaches more advanced weapons handling, such as machine guns and anti-armour rockets, grenades. It will also introduce to the soldier and allows him/her to participate in basic field manauevers such as the section attack, conducting a defense, and recce patrols.
It‘s not one BIG all-encompassing "Basic" course because of various reasons, one of which is that esp. for Reservists, some people (i.e. non-students) have civilian work and can‘t take a whole chunk of time off in the summer, plus it‘d take a lot of continuous weekends if they didn‘t split it up. For recruits who do the courses back to back during the summer, it WOULD be like one big "Basic" course.