How to write crontab

CornTab:
  In terminal:
      -> crontab -e
      -> end of the file write

#35 20 * * * cd /home/zimpu; ./server
#0 * * * * cd && sh ./clearCache.sh
#0 16 * * * sudo apt-get update && sudo apt-get upgrade
#* * * * * cd /var/www/server/db/ && php insertData.php
#* * * * * cd /root/ && ./InterfaceKit-simple