How are C-C bonds represented in bond line notation?
Perhaps the first question one would ask when curious about organic chemistry!
An ethane molecule
Each terminal end has three hydrogens! It's that easy!
However, when we connect these lines into a chain or into a ring is when things may seem confusing. Consider propane and cyclopropane, respectively,
Where each line connects is a
If there are substituents anywhere, you'd merely understand that it has one less hydrogen.
I remember when I started organic chemistry 1, we completely dropped Lewis structures by week 2! So getting this stuff very quick is important or organic chemist's drawings look like hieroglyphs.