This allows teachers to share generally with other teachers. Here, set up a "Teacher Key" (a simple password) and share that with anyone you wish to allow to copy your plans into their account, or share/edit classes together with you using the "Replica" option. Using this method, all tabs/sections for your shared classes will be available for sharing. 

To adjust the classes you wish to share, click on Go To -> Classes and click on a class there. Adjust the "Collaborate" section here to allow sharing. 

This section allows teachers to share a "View-Only" version of their plans with a student, groups of students, or parents. Use this to share specific classes, sections/tabs, and dates with others. This is great for sharing specific information. 

Using this, you can customize what your Math students see while at the same time creating a separate view for your Social Studies students. 

This section allows teachers to customize views for substitutes. Using this section, you can set up a specific view for a substitute to allow them to see all plans for a specific date range/class/etc. This is great for sharing only necessary information with a substitute or additional information that isn't available in the "Students" view. 

Click the three-dot icon in the upper-right corner and select "Add View Profile" to create an additional view. This allows you to add as many additional views as you need to. This is great for setting up multiple different student views for specific groups of students or simply allowing a colleague to view specific information you wish to make available.