Most of the terminology you will learn as you go through the course. However, here is a short list of terms that it helps if you know right away.

Asynchronous and Synchronous

These are very common instructional design terms for online learning. Asynchronous means that the students are able to access the learning in their own time. The learning is available in the online classroom, but they are not required to access or do anything at a specific time. Meanwhile, synchronous is live, real time. An example of this would be a live online meeting where everyone shows up at once, or perhaps a tutoring session.

Most online classes are asynchronous, with little to no synchronous requirements.

Blended

This simply means a blend of online and not-online learning. Most people use the word "blended" to mean a combination of a face-to-face classroom with an online component, and it can be "lopsided" in either direction to be more of one than the other. However, a blended class can also mean engaging in offline, hands-on, or project-based learning as part of the lessons.

Learning Object

A learning object is any object used for learning. This can be big (like a textbook) or small/granular (such as a 2-minute video).

Mastery

A student who can demonstrate knowledge or the ability to do things (learning goals) is said to have mastered those things. Mastery can be at different levels of learning; for example, the ability to create an experiment is a higher level than being able to read and discuss somebody else's. Mastery might also be defined by a percentage, such as 80%, or perhaps even 100%. These percentages are only good measurements if the assessments used are carefully-designed.

What mastery is NOT: jumping through hoops, handing in assignments, and temporarily being able to parrot or regurgitate information. Mastery usually implies a longer-term retention and the ability to transfer learning to new situations.