The phrase "important key" refers to a crucial or essential element or factor that is necessary for something to work or be successful. Full definition
That's the single most important key number for football bettors, and it highlights the importance of always shopping for the best line. (sportsinsights.com)
I think the most important key in pricing is just keeping your respect as an artist. (theabundantartist.com)
That's particularly noteworthy since «7» is the second most important key number for spread bettors. (sportsinsights.com)