I just started with Sudoku and I jumped directly to a difficult level.
I have a hint but don't want to use it. Please provide logic with your answer.
Color your 48 cells with alternating colors. Any cell which sees both colors can be neither 4 nor 8. R3C6 sees both colors, so it must be a 5.
The colors act as placeholders for the digits 4 and 8. You don't know which color is 4, and you don't know which color is 8, but any cell that sees both colors must see both digits and you can eliminate both digits from that cell.