input question: To protect files from being lost,

output answer: back the files up to an external hard drive where the originals are not already stored.

input question: How to trim white margin from map printout.

output answer: Using scissors, cut away from the edge where the map ends and the white margin begins. Do this around all edges.

input question: How to fix a chair that has become wobbly.

output answer:
You will need furniture glue for the best result. Glue the joints and places where pieces meet, such as the tops of the legs or where slats are placed in the chairback. Glue these spots to strengthen the chair. Let the glue dry overnight before anyone sits on it to ensure the glue is set properly.