As I write in the Preface to Simply Wittgenstein:
There are three main reasons for the high regard in which Wittgenstein is held:
Firstly, he emphasized the importance of language to philosophy.
….
Secondly, he maintained that philosophy is not a set of doctrines,
but a method to help avoid confusions of thought. ….
Lastly, he insisted on the importance of context for understanding. …