The number of links to this file. That is, the number of directory entries which refer to this file. Note that symlinks don't count as references. The User ID of the file. The Group ID of the file.
Sizes are in bytes.
Kb multiplies by 1024, so 2Kb is the same as 2048. Ago makes the time in the past relative to when the check is done. Hence makes the time in the future. The first finds files modified within the last 24 hours. The second finds files larger than 10 Mb and the last finds regular files with more than one directory entry.