Skyrim introduced a pretty neat concept to The Elder Scrolls - shouts. Essentially, mortals can learn how to harness the power of dragons through the Thu'um, something that normally takes years to master, but the Dragonborn (us) can learn new shouts instantly. And there's a lot of variety - a huge force push, disarming enemies, calling down storms, sprinting at incredible speeds, breathing fire, and more.
With so much choice, you're likely to end up sticking to a handful of your favourites. And it's those that Reddit user theguy1336 asked the Skyrim community about, "What are your favourite/most used Shouts?"
Aura Whisper cropped up a few times. If you don't know what that is, essentially, it gives you medieval fantasy wallhacks. Enemies are highlighted red and you can even see them through walls, making it a must grab for any stealth build, as you can easily avoid enemies lurking around corners who may potentially break their path to walk right into your line of sight. Others went for the safe and expected Fus Ro Dah, the perfect way to get rid of a companion you don't like on a quiet mountain hike. Aside from those two, Clear Skies came up frequently, and it does what it says on the tin.
Another popular choice is Marked for Death, a shout that makes enemies lose armour and health over time. Funnily enough, there is a risk to using this, as your companion can be effected, losing armour rating permanently. If you do fancy trying it out, keep them out of the crossfire, or be prepared to scum-save.
Soul Tear, added in the Dawnguard DLC, is another popular pick. It rips the soul out of your enemy and, if they die, fills a soul gem. But it goes above and beyond just filling soul gems, as their dead corpse will then reanimate to help you in battle. If you come across a particularly large bandit camp, this is one way to introduce yourself.