I’ll take your questions one by one (https://www.youtube.com/watch?v=MOhpkxi-lOc):
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No royalties for video training tutorials for sale.
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No royalties for tutorial training ebooks or physical books for sale.
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If by project you mean the Visual Studio project file generated for your project, you can share that for free. If you share only to UE4 licensees, no royalties. If you sell it to the public, it’s a Product under the EULA.
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In order to use UE4 trademark logos in connection with your Product, you need a trademark license (which you can get here - Unreal Engine Branding-Richtlinien und Verwendung von Markenzeichen). Also, section 12 of the EULA addresses attribution:
“[Product name] uses the Unreal® Engine. Unreal® is a trademark or registered trademark of Epic Games, Inc. in the United States of America and elsewhere”
“Unreal® Engine, Copyright 1998 – xxxx, Epic Games, Inc. All rights reserved.”
No other license or right in the Epic Trademarks is granted under this Agreement. All use of the Epic Trademarks will inure to the sole benefit of Epic. You agree not to engage in any activity that could tarnish, dilute, or affect the validity or enforceability of the Epic Trademarks or cause consumer confusion or diminish any goodwill relating to any Epic Trademarks. If you wish to make further use of the Epic Trademarks, please go to Unreal Engine Branding-Richtlinien und Verwendung von Markenzeichen