In an even fight make the most of the special tiles that are available, as these can really turn the tide of battle.
Once you've lost take a look at the words opponents created in the post-match round-up, how they used their upgrades, and what you played in response. Learning from other people's tactics will make you a much better player.
If you want to get a one-off injection of silver cash in the game, log-in via Facebook. If you prefer not to battle friends, and would rather take on random global opponents, simply disable the log-in after you've cashed in your reward.
You can extend the length of any word you create is to first look to see if you have the letters "-ING" or "-ED" on the letter tray. These are often a very easy way to spot longer words to put into play, and if you have a spare letter 'S' you should always try to pop it on the end of your creation to see if you can create a plural entry.
The game simply won't let you play a word that doesn't exist in its dictionary.