You can check youtube, but I don't think you'll find it there. Just use common sense:sturdy heavy boxes on the bottom and lighter boxes as you go up.
Don't leave gaps between walls, some GLs will go into trailers and push on the wall to see if it falls back. That's corrective action if it happens more than once. Use small boxes to backfill any gaps between walls.
It's easy to build good walls at 100%, the problem is that many GLs deliberately understaff the lanes forcing TM to work at 140% or more. That's when you start to see things like PIPO cat litter stacked on paper towels and chest high false walls built so the TM can just toss the boxes behind it. The TM then completes the false wall hiding the mess behind it. Load quality goes to ************ as the TM tries to keep the yellow lights off.
Attendance is what gets most people fired. Try not to be even one minute late during the learning period. After that about four call-ins per year is safe.
Meeting productivity expectations is also very important. Target doesn't give new hires much time to reach 100%, I thinks it's one month from date of hire. When I started, we had six months in which to reach 100%.
Basically, just do your best and don't do anything colossally stupid and you should be fine.