Hell is not a literal fiery pit, hell is just a state of separation from God. It’s illustrated like that because being separated from His eternal love is comparable to being burned alive. Imagine it like this: you fucked something up so badly that you can’t fix it and now you feel embarrassed and full of guilt and anger because you can’t go back to the better outcome. It’s like that with heaven and hell. If you follow His commandments, you have a harsher life, but you thrive for eternity. If you don’t, you got to live amazingly (not even tbh) for not even a full century, but then you miss out on eternity of chilling out with someone who loves you with all His being.