Exciting! Here's a sample of the advice I gave little Axecleaver before she graduates from High School in a few days.
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Save half of what you make. As you advance in your career, your savings accelerate. Doing only this and nothing else, you can retire forever at 39.
Take advantage of tax deferred retirement like 401k plans, right away. Maximize the company match so you do not leave money on the table. Increase this to the maximum as quickly as possible. Every dollar you put into tax deferred accounts is less money you send to The Man.
Open a Roth IRA and contribute 5500 a year to that, which will grow tax free. Reassess this as your earning power increases, it may make sense to switch to a regular IRA every year. Take advantage of the saver's credit.
Start saving 20% down for a house. Don't buy a house if you do not expect to live somewhere for at least 3-5 years. Consider buying a SFH and renting rooms out to pay your mortgage.
Savings rates above 50% are very possible and accelerate your timeline even faster. Money at the beginning of your career, due to compounding, is much more meaningful than money you make at the end of your career.
It's never the right time to start a family.
Always be looking for a better job.
Maintain your professional contacts, speak to everyone you know at least once or twice a year.
On Risk: Nothing ventured, nothing gained. Your ability to evaluate risk/reward will improve until you are in your late 20's. As you age, you'll become more risk-averse. Always evaluate the risk vs. the reward, and learn to take the high percentage/medium payoff or low percentage/high payoff risks.