What do skill boosting affixes affect and what they don't?

Some skills, when combined with a particular rune, grant a secondary effect like Demon Hunter Sentry - Spitfire Turret launching rockets or Crusader Punish - Roar exploding in flames upon blocking or Barbarian Whirlwind - Dust Devils launching tornadoes while whirlwinding and so on.

When you have an item that boosts a certain skill damage, does this also boost the secondary rune effect? (tornado, rocket, explosion...etc?)
When you have an item/set-bonus that actually triggers a skill without you using it like the Demon Hunter Embodiment of the Marauder set that causes Sentry to use hatred spenders or the Barbarian Bul-Kathos's Oath that triggers a whirlwind on its own, do these "item" triggered skills benefit from the skill boosting affixes?

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How many skills can you use in diablo 3?

New skills you've unlocked appear on your screen; you can view them at any time on your Skills pane. You unlock more space for skills on your action bar at levels 2, 4, 9, 14, and 19, up to a maximum of 6 active skills, so you'll grow in versatility as well as power.

What is a Physical skill diablo 3?

Physical: A myriad of skills that harm enemies in conventional ways, such as the Barbarian's Bash or the Demon Hunter's Impale, are classified as Physical. As you grow in power, several of your Physical abilities will gain new runes that change their damage type while providing added effects.

How to use skills in diablo 3?

Runestones were originally items in Diablo III that were used to augment player skills in unique ways. Functioning much differently than Diablo II's Runes, runestones were placed into specific skills, changing their functionality, improving their damage, or altering their appearance in some way.

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