Getting start (1) : Choose your online classroom software : Skype, google hangout or Zoom

I would say there are few points that should be taken into account of the free online classroom software.

1. The “stability” ( the quality of the image and sound etc)

2. some functions, such as

screen sharing (available on all of the above),

interactive whiteboard (only available on zoom)

recording (only available on zoom).

3. whether you have an account and download the software in advance ,

Skype : you have to create an account and download the software in advance

Zoom : you do not have to create an account and download the software in advance, instead you will be invited in the classroom via email

The stability of zoom is higher than skype and google hangout since it is a newer technology.

Below extracted from this review : https://www.groovehq.com/blog/zoom-tips-and-tricks

Recording is a tremendously useful feature in Zoom.

Want to keep records of key meetings ? Record them and send them to the person so that he/she can refer back to them.

Just type ⌘ Cmd+⇧ Shift+R (PC: Alt+R) to start recording any meeting.

Type ⌘ Cmd+⇧ Shift+P (PC: Alt+P) to pause/resume recording.