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Frontier Orbitals

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I have my final exam coming up and I am still utterly lost when it comes to frontier orbits.
If you could provide some sort of lesson or overall summary about frontier orbitals, including how they are used in a mechanism, that would be extremely helpful!
I figure that even if this is not on the exam, I should not walk away from this class without at least a general knowledge of the topic!

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This solution helps with a problem involving frontier orbitals.

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Molecular Orbital Theory: Summary
Molecular orbital theory describes covalent bond formation as a result of combining the atomic orbitals on the different atoms involved. Just like atomic orbitals (AOs) describe the region of electron density around an atom, Molecular orbitals (MOs) describe electron density around a molecule.

The simplest example is the combination of two s orbitals a shown below. For any interaction, you must add and subtract the combination of orbitals so you get two MOs - 1 bonding and 1 anti-bonding:
Each s orbital has one electron each and you fill any MOs with increasing energy. So, you end up with 2 electrons in the bonding MO and none in the anti-bonding MO. This means bonding is overall favouarable (i.e. if there were also 2 in the anti-bonding you ...

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