Drupal 8.x

Hello,

I've been working on my site on drupal 8.2.6
but I find out that my website's mailing system isn't working in the forget password, contact form recipient, etc
Is it a problem that my mail MX record isn't my website's
My MX record is pointing to mx.yandex.net
if it's a problem how do I fix it

I would like to embed a video to my site and have followed the seemingly easy steps. Coming to the crucial point of selecting 'full htlm' I don't have that option. I only have 'safe htlm' and 'plain text'. I think I am running Drupal 8. Does anybody have an inclination to what's going on? I'd love to get some pointers. Thanks.

Hey,
I would like a portion of my Main Menu to ALSO appear in that sidebar of some pages.

In the Main Menu the "Machines" Category is organized like this:

-Machines

--Machine Category 1
--- Machine Type 1-A
--- Machine Type 1-B
--- Machine Type 1-C

--Machine Category 2
--- Machine Type 2-A
--- Machine Type 2-B
--- Machine Type 2-C

-Machine Category 3
--- Machine Type 3-A
--- Machine Type 3-B
--- Machine Type 3-C

Hello guys, I'm new here and new to drupal as well. I've been trying to install drupal 8 open social on devdekstop on my PC and been struggling. I'm looking for someone to help me out remotely and I'm willing to pay. I apologize if this is in the wrong section.

Please let me know. Thank you

I'm trying to form alter the user registration form on a Drupal 8 site to show different fields based on a user's selection from a checkbox. I have this working by placing all of the fields into a parent container and setting the #access on the form fields based on the form state's value for that checkbox. Then, when the checkbox changes, I use the #ajax paramater to return the new container.