Conditioning gets the glory, but the barbell work at the front of the week is what actually moves your numbers. Our strength and conditioning weeks start with strength, not sweat, because the main lifts need fresh legs, a fresh back, and a clear head. Do the heavy work first, and you can lift well and recover well.
The cycle is laid out simply. Squat, press, hinge, and pull are the main movements, and they progress a little each week, so the weights you handle in week four are built on the work you did in week one. Conditioning follows the barbell work, not the other way around, so the engine work supports the strength work instead of stealing from it.
Picking your days is part of the plan. If you can train three days, take the strength-led days first. If work or life gets in the way, keep the front of the week in place and move the conditioning day, not the barbell day. Follow the cycle in order, and your numbers will move without breaking your week.