What is the syntax of cron table (crontab syntax)

min hour day month day_of_week command eg. 10 6 * * * at 6.10am every day 0 */2 * * * every 2 hrs at top of the hour 0 23-7/2,8 * * * every 2 hrs from 2300-0700 & at 0800 0 11 4 * mon-wed every mon,tue,wed OR 4th of the month at 1100