The importance of feedback in teaching

2. Make sure it’s ongoing
Continuous feedback complements continuous learning, but 28% of employees report that feedback is not frequent enough to help them understand how to improve.

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  Related: What is 'continuous learning' and why is it crucial?
  

Make a habit of incorporating feedback in all content you create. Be as thorough as to include a piece of feedback for every answer option you present. It may seem like overkill to add feedback to every possible answer, wrong or right, but the more guidance you give everytime, the deeper their understanding of a topic. 
3. Make it relevant 
Feedback should always relate to the material a learner is dealing with in the moment, otherwise it runs the risk of being non-specific, vague and ineffective - it loses its power in embedding knowledge. 17% of employees feel that the feedback they get is not sufficiently specific.
“Feedback has no effect in a vacuum; to be powerful in its effect, there must be a learning context to which feedback is addressed.” -Eloise Marthouret, The effect of quick feedback on employee motivation and performance
4. Complement it with positive reinforcement 
Reinforcement differs from feedback in that it incentivizes the desire for a learner to repeat a behaviour. E.g. to choose the correct answer after choosing the wrong one, or to retake a test or course.
“The most effective forms of feedback provide cues or reinforcement to learners.” - John Hattie, The Power of Feedback
So make sure feedback you provide is encouraging, constructive and positively reinforces people, so that learners are motivated to try again and keep going, rather than giving up in frustration. 
5. Structure feedback well
Before learning is delivered, make the desired outcome clear at the start (set expectations and objectives). Receivers of feedback decide to adjust their behavior by comparing it to a goal. 
Then, in the flow of learning, make sure to deliver real-time feedback, when people make mistakes (or, when they choose a right answer) to reinforce and embed learning. 
If delivering a more formalised assessment or test, compare desired outcome to actual outcome at the end. This could be in the form of a test score screen where results are revealed to learners. Then, provide guidance and positive reinforcement to bridge the gap between actual performance and desired outcome.