at about the 1 minute mark, you have 48 twice in column 4, and a 46 in a third cell. If the 4 is in one of those 48s, the 8 must be in the other - only 4 and 8 can go into those cells. Which means the 4 cannot go in the 46 cell. This information trickles down and completes both box 2 and box 5. You have a similar situation later on (around the 5-minute mark) in box 8. Good solve!
Your mistake was made at 5:40 - you were checking box 7 for 4578, but used a 9 and forgot the 5 (4789). Off camera, you ought to be able to finish the puzzle!
You're probably wondering what happened - at 8:30, you were marking the leftovers from row6/box4, and you left off the 7 from the third cell in that row. Turns out, that cell is a 7 when you complete the puzzle. Keep at it - watching you get better and better is entertaining!
I know it SEEMS like RU-vid is filled with people doing all sorts of activities, but you have to be at least somehwhat GOOD at it if you expect people to watch. People may want o watch someone doing Sudoku. But if they do, they will watch channels of people doing extremely difficult ones who will teach viewers the strategies or solving harder ones. No one is going to watch someone doing easy level puzzles generally made for kids.
