How can I combine the paths with a shape?
Hey community,
I am very new to Adobe Illustrator and I am still trying to understand this difficult program.
For a presentation in school, I am trying to draw a neuron cell with this tutorial on youtube.
Unfortunately, I am stuck at 5:45, where the creator of the video is combining the paths with the "cell body" using the pathfinder. But if I use this, illustrator combines the shapes to this weird shape: 
I think it does this because I didn't expandet the paths or something, but I can't find the "Expand" option in my illustrator.
Can someone help me please?
Thank you very much!