What are your top twenty life hacks ?

Think of money in terms of hours. You make $10/hour and wanna buy that $150 coat? Is that coat really worth 15 hours of work?

Don't recommend a friend for a job unless you've seen them work or you are willing to risk both relationships. A good friend isn't always a good worker.
Recommending them only for them to mess up reflects badly on you and could ruin the friendship and your relationship with the employer.

When petting a dog that is overly submissive, pet/rub their chests not their heads. This will boost their confidence.

Find 3 hobbies, 1 to make you money, 1 to keep you in shape, and 1 that let you be creative.

If you get a kitten, DO use your hands for play so you can teach restraint when they are too rough. Restraint is naturally learned in play with hands and littermates because the fun stops when a bite or scratch is too much. Adult cats who didn't play this way are more likely to scratch or bite.
Obviously this only works if you shout loudly ("OWW!") and stop playing if a bite or scratch is too hard.

Next time you have an easily googleable question about food, clothes, or general life stuff, text your Mom and ask her instead. She probably loves seeing that you still want her advice.

If you accidentally type something in all caps, highlight it and hit Shift+F3.
The same also works if you need to change lowercase to caps.

Before buying a house check it out on a very rainy day to see how effectively water drains.
You might discover some issues with drainage especially in the yard.

If you go clubbing or to concerts a lot buy yourself acoustic earplugs. They don’t muffle the sound, just get rid of the harmful frequencies. Tinnitus is something very easy to get and very hard/impossible to get rid of.

When you have an item you changed your mind on at the grocery store (especially perishables) just give it to the cashier. We really don't mind and you don't have to be sorry about it. It makes everyone's lives easier and we won't have to go through the store looking for misplaced items.

When you have a goal, don't tell people about it.
When you tell people about it, especially in detail, you get a sense of accomplishment that should only be yours when you've completed the task.

So keep it under wraps and tell people when it's done so you can enjoy actually having achieved something and not just the sense of being so noble/motivated for having goals.

If you realize your fridge is getting empty, take 30 minutes to clean the inside before you go grocery shopping again.

If you are given a prepaid debit card as a gift, save it after you spend the money. You can use it to sign up for free trials online without worry of being scammed.

When putting in time for vacation, always take the day after you get back off. This will give you a safety net in case your flight is cancelled. Otherwise you get a day to unpack and relax.

When lending a pen or marker hand it over without the cap, you are much more likely to get it back.

Saying cheese in a photo makes people have lame smiles, words that end in "a" works way better, and give natural smiles.
A trick I use for group photos is to loudly announce this before taking a photo and then use the example word "vagina" everyone laughs. click.

Trying to learn a new language? Watch a movie you know by heart that's dubbed and/or subtitled in that language. It will aid in word association and comprehension and speed up the process of become proficient.

If you are involuntarily bumped off a flight, airlines are required to pay you. If you ask.
2x ticket price, up to $675, for 1-1:59 min hold over, and 4x ticket price, up to $1300, for anything over 2 hours hold over. DO NOT take their free meal or flight vouchers. They must pay upfront in cash if you ask for it.