Funkcanna: In answer to your question "What is swing?" I'm a guitar beginner like you (lesson 3), but I'm an experienced djembe and dunun drum player in the West African Mande tradition. When we use our priceless metronomes (regardless of beats per minute) and play in exact time with the beep, click or light, we are playing the music "straight" or "on the beat." We can crowd the notes by playing slightly earlier, or "ahead of the beat." This gives the music more drive, more energy. Makes you want to get up and dance. We are still in time, but there is wiggle room there. Music is a touchy feelie creation. We can slightly delay the note and play "behind the beat." This makes the music feel relaxing. Different combinations of this create "swing," a lovely feel.
If we go too far either way we are early or late, provoking disapproval from fellow performers and listeners. :-)
One interesting effect is when multiple instrumental parts played "straight" combine to form the feeling of swing. This happens a lot with West African polyrhythms. I look forward to exploring this effect in guitar music. I don't have formal musical training, so I don't know correct terminology. However, I can make a rhythm shwang! Hope this helps. We are early in our guitar journey for making music swing, but as Steve and the rest say, we will get there!