To learn about sharing videos, including options, see this YouTube Help Doc: 
Embed videos & playlists

From google help doc:
Turn off personalized ads

Creators who are part of the YouTube Partner Program have the option to disable personalized ads. If you plan to turn off personalized ads, we recommend disabling them in YouTube Studio and not in AdSense.

• Sign in to YouTube Studio.
  Note: Any content that’s marked as made for kids will automatically have personalized ads turned off.
• Click Settings.
• Click Channel.
• Click Advanced settings.
• Scroll to the bottom section Advertisements.
• Check the box for Disable interest-based ads. 
  If you select this option, personalized ads will not be shown on videos on your channel, such as ads based on a viewer's interests or remarketing ads. This may significantly reduce your channel's revenue. In addition, earned action reports and remarketing lists will stop working for your channel.

If your YouTube account is Monetized:

• Sign in to YouTube.
• Click your profile picture and then YouTube Studio.
• In the left Menu, click Content.
• Select the video you want to turn off ads for.
• In the left Menu, click Monetization.
• In the top “Monetization” box, click Off and then Apply.
• In the top right, click Save.

Disable Suggested / Related Videos

For How To, check out this video:
How to Disable Related Videos on Youtube Embed 2020

As of April of 2018 Google decided to give greater control of playback to users. 
In addition to adding autoplay=1 to the url, you also need to add &mute=1. 

Only muted videos will autoplay.

example code:

<iframe id="existing-iframe-example"
          width="640" height="360"
          src="https://www.youtube.com/embed/-SFcIUEvNOQ?autoplay=1&mute=1&enablejsapi=1"
          frameborder="0"
          style="border: solid 4px #37474F">
          </iframe>

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