Tier 1 enrolment is for those students who want to move through the curriculum at their own pace.
Students have access to the course content for two years, so there is loads of time to study and implement the lessons.
There is no live direction through the lessons by instructors, and no assignments to complete, so those level of enrolment is for those students who want the information but can understand and apply it themselves.
If you would like more support than Tier 1 enrolment, check out Tier 2. That will likely be more suitable for you.