How to use strategies? You read and re-read them, till you memorize them.
That helps you staying coherent during the strategy execution. Of course, if your strategy is pages long you may have your troubles memorizing it. So, if you can’t memorize your strategy chances are it is not a strategy.
Strategies are short statements, say less than 50 words, backed up with supporting evidence. The evidence is written separately from the strategy, and it may take more space, say half to one page.
If you need more space to describe your strategies chance are you are not writing a strategy but rather an operating (executive), short-time oriented document. Strategies are long-term oriented, say 5+ years.
Read also 10 key elements of brand strategy