How to train remotely?

I (re)started the blog after months of mental preparations ... and thought it will be for DevOps, scripting or related things.
On the other hand, I feel internal pressure to share experience that teachers may find useful now.

I was high school and academic teacher for a few years.
That experience helped me to become a trainer in my company. I was leading up to two, 3-hour, remote, training sessions a day for almost 2 years. There were from few to ~150 attendees.
Despite my role was more technical after the 2 years period, I was still leading training sessions:

• remotely -- I was not in class room and students were not in class room as well
• on site -- me and students were in the same class room
• "hybrid" -- me and some students were in the same class room and some students were remote
• "remotely" -- students were in class room and I had to lead session from home office (extraordinary situation, happened once and didn't work at all)

You know a little bit about me, so let's focus on question given in the post subject:

1. You will need some TeleConf tool
1. There are quite many available -- you may just give a try to zoom. You'll get your personal meeting number that you can share with your students
2. Test the tool just to make sure it works well for you
2. Announce the training session
1. Write on facebook, WhatsApp, blog, email or use any communication channel you normally using when contacting your students (pupils or their parents)
2. Share meeting url, meeting time, if people should confirm, etc.
3. Check the content you are to share with your students
1. you may want to record your training session and share with those who were not able to attend
2. even if you are not recording, some attendee may record confidential information 
4. Start training session at given time 
1. share your screen with some slide
2. wait up to 5 minutes so everyone who wants to attend is able to join
5. Say "hello" to joining persons
1. to make sure they can hear you and you can hear them
2. make sure they are able to see what you are sharing
6. Start training session setting "social contract"
1. students are asked to mute and stay on mute
2. questions can be raised on chat during training session
1. Type on chat something like : "Write your questions here"
2. Ask students to check they can see your message; you'll confirm chat works fine and students see where the chat is
3. unmute when there is a Q&A or discussion
7. B E    S L O W
1. there may be weak connection and some words may be missed
2. if you switch forward and backward, users may see not clear picture
1. before you switch to next view, think if everything to be said about current view was said
2. check chat to make sure there was any question related to current view
8. You've got set of individuals instead of a class.
9. Be aware, not seeing them, you loose a lot of information
1. Check awareness of the attendees from time to time during training session (2 - 4 x more often than you'd do in class room)
2. Talk to your students after the session to get feedback. Use the feedback to be better prepared for next session

Feel free to comment if you think some crucial information was missed.