Tournament Poker

Which poker strategy should be used? It all depends on the table you sit at.
I believe that observing will always be the best option, but there are countless players who would think this strategy is bad. The fact is that it's essential to play with the rulebook in hand.
Please, comment on which of the many options you prefer?

I don't understand the question.
Who would ever think that 'observing' is bad? How does this relate to a rulebook?

I'm not sure what the many different options are? Could you perhaps classify them?