Side Counts and what you need to know
The best explanation of Side Counts and their values is found in "The Theory of Blackjack".
If you are playing a HAND-HELD game, Aces are crucial for BET SIZING and 7's are valuable
for Basic Strategy departure plays. The 8's and 6's add almost no value.
The Hi-Opt I Count [see "World's Greatest Blackjack Book"] offers info on this.
Better by far is the info developed with Hi-Opt II, the ultimate count.
Those wanting deeper knowledge of this subject can email me.