Before looking to improve your blackjack skills you must be sure you know the game rules very very well, no rule no matter how small should be unknown. After learning the rules it seems obvious what the best strategy is, but it is only a basic strategy. Best results come with more complicated strategies such as card counting. It is said that in order to obtain advantage through card counting you need a super brain. In fact there are more card counting techniques, different from one another. Unfortunately card counting is more suited for live gambling than online playing, but still, it is something all blackjack players should have knowledge about.
So it becomes clear that in order to succeed on blackjack gambling the first thing you can do is read a lot of rules and strategies. And as theory is nothing without practice you them need to play a lot. Play with friends before starting to put money on table. Then continue with online gambling on websites that offer a no deposit bonus, just get free money and see how you get along with the game. Games that involve money will be pretty much different than the ones played with friends. You can write down the results and after a certain number of games you can get an idea on what strategies work best for you. The same strategy can have different results for different players.
It is true that being a card game luck is involved in most of the hands played, but it is obvious that experienced players can often end up a gambling session in profit. This means that mastering the game can be achieved and a professional player can be a constant winner. Beside official games where money is involved and you might change strategy from one hand to another you will always need practice sessions, just pick a strategy, play for one whole hour and try to master the game. Good luck!