I would recommend connecting with them on LinkedIn & sending them a message after they've accepted. You could also just send them a brief email using their university email address. Most profs/teachers in general are really happy to hear from previous students regardless of how long it's been. Best of luck!

Congratulations! What an awesome achievement!

Congrats everyone!

Congratulations to everyone!!

@MF218 I second this!!

@StarBrooks 100% agree, the explanation with the use of visual aid is super helpful. Wish the previous modules were similar to this one.