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To create a private channel for a team
1) Go to the team you want to create the private channel for and choose More options 
> Add channel.
2) Enter a name and description for your channel.
3) Under Privacy, select the down arrow on the right, and then select Private – Accessible only to a specific group of people within the team.
Add members to a private channel
1) As a private channel owner, you can add or remove members, and edit private channel settings. Each person that you add must first be a member of the team.
2) To add members of your team to a private channel:
3) Add members > More optionsNext to the private channel name, select
4) Use the Members and Settings tabs to add or remove members and assign roles. Your private channel can have multiple owners and up to 250 members.
5) When you’re ready, select Done. Members can now post messages in the private channel.
Manage private channel creation
As a team owner, you can turn on or turn off the ability for members to create channels. To see and change this option, go to the Settings tab for the team.
Edit, delete, hide, or leave a channel
1) Select More options next to the channel name. Then, use the menu to edit, delete, hide, or leave the channel as desired.
***Please Note: Team owners get to decide which team members can delete channels.***
Keep in mind that once you delete a channel, you also lose its entire conversation history. However, the OneNote sections associated with that channel will still show up on your team's SharePoint site.