Blackjack pits you in a fierce battle against that dealer. You have 52 cards and out of those 52, there are 16 cards with a value of 10. These are the big ones because you have

-10 Itself
-Queens
-Kings
-Jacks


It leaves you with a 32% probability of having a 10 value card once they are all dealt. Other than that, you have 7% chances of having cards of other categories. You have been reading simple strategies involving 10s in blackjack. The fact is that most of the players out there know these simple strategies and now they are not useful at all.

Not being useful means that their accuracy has faded away to a great extent. Everyone out there knows these simple methods so they are all moving on to advanced strategic measures in online blackjack.
More importantly, the people who program these blackjack games, know a way of putting you in a situation where simple strategies don't work. However it is good to know a simple strategy involving 10 and combinations higher than that.

We assume at this point that the next card will be a 10 after being dealt to you. If your hand value is already 11, prior to having a 10, then you have to hit. For one reason, you don't want to go beyond the big 21.

It all depends upon the face up card of your dealer and you plan your moves accordingly. The dealer is always trying to have a higher edge so he will do his part of the deal. If he is going to stand on a hand with a 17 value then it is going to be like this for a while. Otherwise he is going to go for a draw and then grab another card. Competition is part of online or land based blackjack so you need to move ahead from basic concepts through rigorous practice.