how to count cards blackjack

"The count never be negative when the Blackjack card counting?
Yes, I know the values but do not know if the number can never become negative. I use the Hi Lo, 2-6 = 1 10-A -1 = 7-9 = 0
Yes, the number can easily reach it can go auget positive. And they to see the numbers oftan auget exactly as you see positive numbers. when the number will increase auget home advantage and a good idea to stop playing and find another table.
How to count cards in Blackjack