The puzzle for which you've sent the screenshot of, you are missing a couple of letters for the top sentence.
As for "10", there are 24 empty spaces, plus 2 letters filled in. That should hopefully clue you in
I realized I missed the S and I in the screenshot, though now I'm even more confused. I don't know what the opposite of it is, even looking it up isn't getting me anywhere, its either 5 letters or 7 letters, and all the 6 letter words that I can find don't work. I'm lost with that part.
As with '10', I know that the two letters clue into what the symbols they're lined up with, though that doesn't seem to help me with figuring it out. The only thing that seems to line up is that the symbols on the top of the grid all have a dot in the center and the ones on the left don't (Hence me getting that it was linked to pigpen.) Though when I try to see how they are linked with the other symbols it just confuses me more, since they're all rotated and much different than the ones in pigpen that it's a roadblock.
Edit: Also with the 'rotate' puzzle it seems really tedious having to go through so many combinations just to find one or two of the lines having the start of some words but then not working, I've exhausted all the hints for the ones I'm stuck on at this point. not a clue as to what to do.
1) opposite of (to) "contract" (verb), 6 letters
2) As you've seen with a previous grid puzzle, 26 letters + 10 digits fit nicely into a 6x6. But 26 letters don't fit nicely into a 5x5. So you kind of have to. squeeze it. So every cell is one of 2 letters. the 9th cell shown, is either I or J. So for a 4 cell word, write down those 4 cells (4 letter pairs), and make a 4-letter word out of them.
3) Rotate puzzle actually shows both correct solutions at once. Note that there aren't that many vowels, and you need at least a couple per word. (hint: try making a word starting with the central S)