Need Advice Please.

Ive been confused about how people talk about progression betting is bad. It would really help me if someone could tell me how I should bet my hands? I'll tell you how much I know and maybe someone can give me advice on how I should bet? I use the high-low count system, I know perfect basic strategy for mutiple decks dealer stands s17 no doubling after pair splitting and doubling after splitting double on any two cards, and also know the same charts for strategy numbers from "Professional Blackjack". Also I am a $5-$25 player right now. Thank you for any responses and it would also help if you told me how you bet your hands.