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I've been playing AoS for about 9 months, supplying both sides of the starter box.
Just picked up the GHB and I've not memorized it and don't know a lot about the army lists that require book purchases.
Is there any game effect where Bravery of a single model unit is affected?

I'm not sure what you are asking about, but there's a bunch of ways to raise or lower the bravery of a single model unit. There's terrain effects and spells and abilities.

Single model units don't worry about battleshock, if that's what you are concerned about.

However, there are some abilities that test against bravery, for example a terrorgheist rolls a d6 + 6 and compares that to the units bravery. if the terrorgheist rolls higher, the difference results in mortal wounds to the target.

I know a non-chaos single model unit can be made to take a battleshock test if you throw right for the gargoyles on an overlord bastion

Also the screaming gargoyles of the malefic gates can cause a battleshock test, you can modify the bravery of the unit by moving stuff like chaos knights close that cause a -1 bravery when within 3 " of an enemy unit, There is also a trait in the chaos range that does the same, there is also sinister scenery pieces that can modify bravery, and I can imagine a lot of units have abilities to give a -1 bravery to a unit.

https://www.games-workshop.com/resources/PDF/AoS_Warscrolls/aos-warscroll-gaunt-summoner-en.pdf warptongue blade

Wargington wrote:
https://www.games-workshop.com/resources/PDF/AoS_Warscrolls/aos-warscroll-gaunt-summoner-en.pdf warptongue blade

That doesn't affect the Bravery of a single model. It uses the unit's Bravery to determine if a model is slain or if only a single Wound is inflicted.

All models fight in units, units include one or more models.

Wargington wrote:
All models fight in units, units include one or more models.

Even if the unit only consists of a single model, it is still a unit. The Warptonue Blade would still use the unit's Bravery even if it were a single model. On top of that, the question was if there was anything that affects a single model's Bravery. The Warptongue Blade does not affect Bravery in any case.

On top of that, the question was if there was anything that affects a single model's Bravery.

Is there any game effect where Bravery of a single model unit is affected?

The question was about units, albeit single model ones.

Anything (I can think of) that affects units also affects single model units.

There are a number of units that have abilities affecting enemy bravery, usually -1 bravery if in a certain range. I'm less sure on friendly bravery, +X bravery tends to be for things like banners etc, which are not going to be single model units. There may well be some +X bravery abilities but none jump straight to mind.