What are somethings you learned way too late you could do in dying light? (Dumb Edition)

Here's my take. Newbie here just bought dying light 1 2 weeks ago and completed it. Later Bought Dying light the following and had to complete the main storyline all over again. . . . . . . . . . All of this and farming supply(I learned after completing the game) to get the grappling hooks to learn from a youtube video 3 minutes ago that you can climb on to the bridge in Harran!.

I spent a good 3 to 5 hours farming volatiles to get my levels up. My damn fighting was full when my agility was on the downlow. All of this just to get that damn hook to climb the tower. Maybe Fatin and Tolga was right.