I created the Sequoia pitch deck template in 2015 from this document. It's since helped more than 3 million founders build a better pitch deck.
Sequoia's recommended deck flow.

What do you do? Who do you help? How do you help? Keep it simple.

What are the biggest problems you solve? Who do you solve them for? How do those people solve these problems without your solution?

How does your product solve the problems discussed previously? What makes your product unique? How does it work? What are some common use cases?

What trends make now the perfect time to introduce a product like yours?

How big is your market? How much money could you make if you dominate your market?

Who do you compete with? What makes your product better than theirs?

What does your product look like and how does it work?

How do you make money? What are your unit economics?

What makes your team the right team for the job? What relevant experience and expertise do they bring to the table?

How much money do you expect to make in your first few years?

Less is more. Keep your content simple and don't overwhelm your story with complex design. Make sure your deck proactively answers common investor questions and objections before they get asked.
Need more help? Check out my free Pitch Deck Guide for more hints and tips on what to include in your pitch deck. If you need a helping hand, check out my pitch deck coaching services.