10 things you should never do at a golf course, according to PGA pros and employees

• Business Insider asked golf pros and employees what not to do on a golf course.
• The experts said leaving ball marks and setting your bag down on the green is bad etiquette.

Whether you're a first-timer at your neighborhood links or planning on visiting one of the world's most prestigious golf courses, following proper etiquette is imperative.

Business Insider asked PGA pros and course employees about the biggest mistakes people make at golf courses — and how they can be more respectful players.

Here's what they said.

Don't waste time watching shots if you want to keep things moving

Justan Johnson, a PGA golf instructor at East Potomac Golf Links and the owner of Blue Golf Performance LLC, told BI that he doesn't like when golfers waste time watching other players' shots land.

"Instead, they should be playing 'ready golf' — meaning standing at their ball quietly, without distraction, preparing for their next shot while their partner is hitting," he said. "As soon as their partner's shot lands, they should be hitting their shot in the next 20 seconds."

Johnson added that keeping things moving can save about 30 minutes a game.

Don't break the dress code — it exists for a reason

Erika Larkin, the director of instruction at Creighton Farms Golf Club, told BI that players should always pay attention to a golf course's dress code. Wearing things like jeans, tank tops, and backward hats can be seen as disrespectful.

"Golf has always been a game about class and integrity, so it's best to wear proper attire like a collared shirt with golf shorts or skirt," she said.

Forgetting to repair your marks on the green is bad etiquette

Another classic faux pas is leaving ball marks on the greens — which can mess up other players' putts.

"A simple rule of thumb is 'make one, fix four.' When you approach a green, fix your ball mark and another three ball marks with your divot tool," Johnson said.

Putting your golf bag on the green is also frowned upon

Larkin advises players against leaving their heavy bags on the green.

"It can damage the green and create a distraction for the players in the group," she told BI.

Never dangle your foot outside the golf cart

Don Rasmussen, the lead instructor at Circling Raven Golf Academy, cautions players against misusing golf carts — especially while they're in motion.

"We have had a couple of golfers that dangled their legs," he told BI. "The result ended poorly as they both caught their foot on a railroad tie and caused a spiral break in their lower leg."

Avoid playing music too loud (or at all)

It might be tempting to bring a Bluetooth speaker out on the course for a fun day, but Johnson advises against it.

"In a business setting, the wrong song could destroy a relationship or even a deal," he said. "Keeping your volume to a level that doesn't distract or offend your playing partners but you can still enjoy is best."

Whatever you do, don't drive into native grass off the green

Golf carts should ideally only be driven on the paths along the links. Venturing off into native grasses to the sides of the greens isn't a good idea.

In fact, at some golf courses, Rasmussen said it can cause the carts to shut down automatically.

"You will look pretty funny being the person pushing your cart back into the normal course of play," he told BI.

Never destroy the greens, or you might not be welcome back

One of the simplest ways to get barred from a golf course is damaging the green — whether intentionally or unintentionally.

"If there's any sacred ground on the golf course, it's the putting-green surfaces," Johnson told BI. "They're mowed low and rolled to be as smooth as possible for maximum enjoyment. One scrape on a green could change the direction of someone's putt, causing it to miss."

Arriving late for your tee time disrupts the whole day

Jason Crawford, the PGA head golf professional at Massanutten Resort, told BI that timeliness is necessary when heading to the golf course.

"Check in 20 minutes before your tee time," he said. "Tee time means starting the first hole at your time. If you begin after your tee time, you throw off the rhythm of the course for everyone."

The pro also mentioned that beginners should choose tee times later in the day to enjoy a more relaxed pace — golfing behind veterans who hit the links early can feel rushed.

Avoid letting your frustration get the best of you

No matter how frustrated you are with a shot, Crawford said, letting your anger out in obvious ways disrupts the vibes on the course.

"Avoid letting frustration take control," he told BI. "Throwing clubs and cursing not only disrupts your game but also affects others' enjoyment."