This sketch just gives us a conceptual idea of what a linked list looks like. Do not worry about details yet.

We'll be hiding the backward links in many cases just to simplify the diagrams (it is symmetric).

We'll remember the backward links are implied.

Unlike arrayed structures, link list nodes are not in contiguous memory.

Note -- We will find out that this fact has some pros and cons regarding performance.

For scratching out your ideas.
Right-Click "Save image as"
Open image and sketch on it