For 26 years I have been creating materials for my classroom. I never once thought, "I should keep these to create a portfolio!" ... that was a mistake! Well, now I am trying to compile a few things I've made in the last few years as a sample of what can be done with free tools available for all.
A Desmos Activity Builder with Video Helps.
This desmos activity includes an introduction video, summary page and then examples. The examples have video hints when incorrect answers are given.
A Desmos Activity Builder Self-Grading Test.
The test is unique from a homework assignment, in that corrections cannot be made once the test is submitted.
A Desmos Activity Builder Self-Checking Homework.
The homework assignment is unique from a test, in that corrections can be made after each answer is checked.
A Desmos Activity Builder Daily Opener / Check-In.
Interactive opener / check-in created in Desmos Activity Builder.