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https://releasenotes.docs.salesforce.com/en-us/winter21/release-notes/salesforce_release_notes.htm
As mentioned earlier you will not get exact PPT but the below links have images and Video, Which you needed.
You can take them as a reference and prepare PPT easily.
https://cirrus.red/posts/2020/08/24/key-dates-for-winter-21-release/
https://automationchampion.com/
https://www.salesforce.com/blog/2020/08/winter-21-sandbox-preview.html
salesforceben.com/10-of-my-favourite-salesforce-winter-21-features/
I hope you find the above information is helpful. If it does, please mark as Best Answer to help others too.
Thanks.