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Example Three: Focus Fire!
Buff Stack -> Number of stack by buff of your character (buff name in english, case sensitive)

 
Focus Fire is a really awesome Beast Mastery spell. It uses Frenzy stacks generated by your pet to increase ranged haste. It is the heart to the BM hunter's DPS (that doesn't come from pet of course). In this example, we set it so Focus Fire is only called when your STACKS of Frenzy get to five, which is the max. This gives you 30% ranged haste for 20 seconds, whereas using it at a measly 1 stack only gives 6% for 20 seconds. This is ideal for boss rotations, but if you are simple bot gathering/grinding, it will probably never fire. So you can change the condition to fire at stacks BIGGER than 2. That is probably optimal for a gatherer.

Example Two, adding Hunter's Mark to your fight class.
 
Target Buff -> Check if your target has buff (debuff) (buff name in english, case sensitive)

 
This will simple check if your target does not have the buff "Hunter's Mark", if you had this at true, it would only cast Hunter's Mark IF your target already had the buff, which just seems like a big 'ole waste of time. Also, notice how Hunter's Mark is below Mend Pet in the list. Spells that are on the top of the list will be cast first. In fight classes meant for soloing, I use Survivability > Offensive Cooldowns > Damage.