As for video conferencing software... More likely than not your employer has standardized on one or a few of these tools, and you should use those. If you've got room to pick and aren't sure which to choose, consider my experiences:

• Zoom: Best overall. Professional quality, scalable, reliable, and feature-rich.
• GoToMeeting: Runner-up. Professional, scalable, reliable, and feature-rich. Some of my colleagues ding it for having a "confusing" UI. I think their mistake is trying to use the web UI instead of downloading the desktop client or app.
• Webex: the UI is primitive and lacks sharing features present in many other tools.
• Skype: Second-class features, performance, and reliability.
• Google Hangouts: Limited feature set but very easy to use, especially if you're on GSuite. Great for small groups, scales poorly beyond that.
• Slack: an excellent chat tool with terrible video conferencing. Slow performance, frequent drops, hangs the app. Stick to typing for now!