Pitch deck is used from start-ups and scaleups to practice and pitch in front of investors at all stages, but especially at the Growth stage.
Pitch decks can also be used to attract human capital at any point, and more
Should be kept up-to-date at all times to help C team stay focused, keep metrics, shape vision, mission, GTM strategy and promptly make necessary adjustments.
Good pitch decks and pitches win money, convince investors about potential and progress made.

Pitch deck contents are usually introduced during trainings for start-ups, in informal setting in the start-up community, discussion with mentors, friends and family, online courses or books. Each team should have training sessions during the acceleration phase om the concepts and specifics in the pitch deck and should be covered in the mentoring session along with independent research and preparation.

Note: There are numerous pitch decks of successful companies that are made public, and it is worth exploring tens of examples to identify the most relevant format and information that applies to own business.