Of course, casinos don’t like those people who are able to count cards, because they usually hit the jackpot. You can easily become such a feared by the casino person. You shouldn’t be a professional gambler to learn the Hi-Lo card counting blackjack strategy, because this system is rather simple and may be with a bit of practice you can automatically use it to your advantage.
Hi-lo betting is known as point counting as well, because you give a value of -1, +1 or 0. It depends on the specific cards dealt:

2, 3, 4, 5, 6 (small cards) +1
7, 8, 9 (neutral cards) – 0
10, face cards and ace (large cards) – 1.

While using this method, you should add or subtract points, noted above, for each card that has come out. And then you should make mental calculations of cards from one hand to another and make wagers, depending on the positive or negative running totals. For example, if the positive count is high, there is a higher number of high value cards, remaining in the pack, and it’s high time to think about considerable raise of your stakes. If a running count is close to zero, it means a neutral deck i.e. the casino is unlikely to hold an advantage over you. But everything is possible; in this situation the casino can have the winning position.
In the case of high negative count, the advantage completely belongs to the house. May be, it’s just not your day, walk away, relax and soon everything will be Ok.

Use this strategy and you will make sure that this system is rather effective, but always keep in mind that no system can guarantee you 100% success.