The best way to get Texas Holdem tips is to read. You can find useful information both in books and online.
Nowadays, with the tremendous spread of poker, it seems that every second person writes books about the game. All of them would call themselves 'poker-gurus,' 'poker experts' etc. So if you are trying to choose something to read on this topic, it is very difficult not to be drowned in the vast ocean of literature.
We advise you to read books written by famous people. For example the most famous theorists of poker are David Sklansky, Mason Malmuth, Doyle Brunson and "America's Mad Genius" Mike Caro. These guys are real authorities in the world of gambling. It is also very useful to read guides by successful practical players. If they have won some major tournaments or even WSOP it is much better.
Internet is one more good source for poker tips. There are plenty of poker forums visited by thousands of people every day. You can post any question and it certainly will be answered. Plus there are a lot of sites containing articles by famous players.
There are also video guides and poker schools. But the object lessonsdo not differ greatly from the written text.
So, choose what you like the best or - even better - combine all mentioned methods of getting Texas Hold'em tips and improve your game.