How to save my prorgress?

I just started with the most basic beginner and had to leave. I came back and see that my progress wasn’t saved. Is that possible to save and continue later? Or do I need to start over and complete it 100% in one sitting?

What progress? With the lessons? Did you sign in?

I got 27% done at the section you can choose to pick " Start at the very begging." And yes i was signed in.

the “start at the very beginning” is always there, just open the list of challenges below and go to the first uncompleted challenge
there is also a big yellow button that brings you to where you left