Before you start designing your case in TINKERCAD, make sure to get a rough idea of what you want your case to look like by creating a hand-drawn sketch.
After you have a drawing you are satisfied with, visit Tinkercad’s website-
You’ll need to create a free account to access the service.
Choose your type of account.
Fill the details and click on the Next.
After logging in, you’ll be greeted with a screen like this one:
Click on “Create new circuit” right below “Circuits” next to your profile picture. A new page will open up.
In Tinkercad, one can go with 3D designing or Circuit making. There is a new feature Codeblocks, it will help you to design with codes. There is a section called Lessons which saves all lessons you have attempted.