Lesson 1

Spaces, Tools, Lists

Lesson 2

Statuses

Lesson 3

Tasks

Lesson 4

Subtasks

Lesson 5

Recurring Tasks 

Lesson 6

Checklists

Lesson 7

views

Lesson 8

custom fields

Lesson 9

time tracking

Lesson 10

comments and mentions

Lesson 11

attachments

Lesson 12

automations