Save every penny you can, preferably into retirement accounts.
If you hate your job, find another job. Something you hate now will only get worse as you age.
My father once said if something irritates you about a significant other before you wed, it will only get worse after you wed. Note: his verbiage utilized some language we try to avoid on this forum.
Travel so long as it does not cause you to go into debt.
Debt - be sure you have none except for housing and transportation.
Live below your means. If you make $20 and spend $20.01 you will never be happy. If you make $20 and spend/save $19.99 you will never be unhappy.
Buy on quality, not price. $100 spent on a piece of furniture which will only last 5 years is not money well spent if you can find a $300 piece of furniture which will last 40 years.
Do not keep up with the Joneses, they are more than likely up to their eyeballs in debt.
Drink water in a restaurant as opposed to soft drink or tea, save thousands over a lifetime.
If you can do it yourself perfectly then do it since no one else will do it perfectly. If you cannot do it perfectly then find a professional who will.
Make every career move you initiate a move forward. Some moves will be made for you and they may set you back.
Do not be afraid to say NO.
Make your goal to save a year’s worth of expenses in case of emergency. That way if you want to quit or get laid off you are safe and don’t have to take the first job you find. It’s much easier to buy a car when you are driving then when you are walking.
Ask yourself if you need something before you buy it. It’s fine to splurge, but buying something you don’t need just accumulates stuff. Often you can rent or borrow and return. Always return in as good, or better condition than the item was provided to you.
Don’t break the rules or laws. The truth is the safest lie.
Be careful who you tell what. Not everyone wants to see you succeed. Similarly, hold your cards tight to your chest with regard to politics, salary, and personal matters. A true friend will be there whether you are king of the world or living in a slum. The key is finding those friends and surrounding yourself with them.
If you are doing something which doesn’t bring you happiness or doesn’t make you money, then stop and do something else.
Lastly, drink water, as much as you can stand, all the time. You will always feel your best when you are well hydrated.