How is it clear that in that place it's a 7? Why is it not a 5?

@Adelin if you look at thd possible numbers at that cell, you can see there is only a 7. What makes you think there should be a 5

@Adelin I have updated the answer with the proper explanation.

@VotBear, thanks for the remark please see the updated answer

@Mhmd - your additional note is not true either. You can have a 3 on row 5, col 7 and a 5 on row 9 col 9, thus allowing to have a 5 on row 2, col 8

@Adelin no it is not possible. What will the value of row 9 column 8 be then? When you have two cells in the way explained above they are called naked pairs: sudokuoftheday.com/techniques/naked-pairs-triples

row 9 col 8 can be a 3

@Adelin I don't think you understood the point. You have to look only a column 8. In a sudoku any column should have the numbers from 1 to 9 only once. If we apply this concept to column 8 we can see the cells in row 5 and 9 can have only the values of 3 and 5. If one of them is 3 the other should definitely be a 5. If you are still confused, please look at the link in the above comment to know more about naked pairs.

actually on column 8 you can have a 3 on row 8 as well, or a 5 on row 4. Why not?

I’m around

I was super excited but sadly R9C8 can have a 7

actually it can't... hmm

because 7 can either be on R7C7 or on R7 C9

That's the explanation

you should edit the answer and post this rationale: the fact that 3 and 5 can only be in those 2 places (and how you came to that conclusion)

@Adelin yeah sorry for confusing you but I usually eliminate obsolete possibilities on the go.

np. i upvoted. edit and I will accept the answer