Will every person enter the Hellfire on the Day of Judgment according to their sins, and then exit it, or are there those who will enter Paradise directly without entering the Hellfire?

Not everyone who commits a sin will enter Hell. Allah may forgive them, or they may have sought forgiveness, or their good deeds may outweigh their bad ones. Allah forgives sins, other than shirk (associating partners with Him), for whomever He wills. And whoever enters Hell from among the Muslims will eventually exit it, even if after a long time. There are seventy thousand who will enter Paradise without reckoning; they are those who do not seek ruqyah, nor believe in omens, nor use cauterization, and upon their Lord do they rely.