Write a piece of advice (paragraph) to any of your sibling/ friend/ cousin who is going to travel some far-off place in foggy weather. Suggest him some precautionary measures, he must take for a safe journey.

I would say something like Make sure to be safe out in that foggy weather you could get hurt. Or say like, Make sure to look out for other cars while driving :>

Explanation:

yup a s f

the anwser is went creeping down the river again, across the wide lonely marshes to the sea.

i longed to go with them out into the world to seek my fortune in foreign lands—africa, india, china and peru!

and, dreaming of the lands i had never seen, i'd sit on there, watching till they were out of sight.

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.