For the signal to continue, it needs to reach a dendrite.
When you learn, your brain changes - the dendrites grow! They "close" up the gap, forming connections in your brain.
How to grow dendrites: use as many senses as possible when learning! e.g., talk/explain your learning to someone, use movement (write it down, act it out, take a brain break every 18 minutes), draw a picture as a visual cue, .... [more later].