I would like to download power point on my computer

As others have indicated, PowerPoint for Mac is not sold as a standalone program at a reasonable price [US$179.99]. It is available with the purchase of the Office 2024 Suite [perpetual license] package [US149.99] & with a Microsoft 365 Subscription [as little as US$99.99/year]. Both options are more cost-efficient than buying the individual program.

However, the online PowerPoint web app is available free to anyone. It is not as robust as what the locally-installed desktop software provides but may be adequate for your needs:

https://www.microsoft.com/en-us/microsoft-365/powerpoint-b?ef_id=k_636f3e59e9df1167f8fb5680db0e85d7_k&OCID=AIDcmm474qp8el_SEM__k_636f3e59e9df1167f8fb5680db0e85d7_k_&msclkid=636f3e59e9df1167f8fb5680db0e85d7#Plans-and-pricing

You can purchase a single Office application, such as PowerPoint. It will be rather expensive compared to getting one of the cheaper suites, though. See https://www.microsoft.com/en-us/microsoft-365/p/powerpoint/cfq7ttc0pbmc .

Its a component of o365, which you buy

https://www.microsoft.com/en-us/microsoft-365/buy/compare-all-microsoft-365-products