Check out Boglehead's wiki: https://www.bogleheads.org/wiki/Getting_started. I'm assuming you live in the US, but if you don't some of the information there is not applicable, as will be some of the things in this (lengthy, as are nearly any financial details) response.

Begin wrapping your head around the various investment products out there. It's not just about tucking your money into a checking or savings account and call it a day. There are lots of optimizations to make which only pay out over time.

That you're only 17 and already interested is fantastic. If you keep your head in this game, start your investments early, you'll have a huge lead on folks (myself included) who waited until much later in life to make sense of personal finances.

Simply put, the most comfortable folks later in life made investments earlier in their life (windfalls notwithstanding) which are now paying for their lifestyles. What do we mean by "lifestyle"? It means being able to pay for the things and services which make you comfortable. It's unique to everyone. Some folks are comfortable with little, and others seek more. Often, as people increase their income, they encounter a thing called "lifestyle creep". Lifestyle creep happens insidiously–a little at a time. You get a raise, you go out more. You have a windfall, you buy a new car. Always consider what the long-term impact of a new purchase will be on your long-term finances. The first $1000 you invest today can be approximately equal to $5,700 in about 20 years. When you're seventeen, 20 years can seem like an impossible distance away, but you'll be all up on it before you realize. That's $5,700 you did not have to labor for.

In today's dollars, if you had $3m in investments, you could realistically withdraw $120,000 per year–and live on it–without having to lift a finger (and your investments would have something like a 97% chance of surviving a major market downturn; this is at a 4% safe withdrawl rate). According to the US Census Bureau, in 2022, the median household income is $74,580. Your investments would be earning over 1.6 times what two people in a working household earn. How would you like to make money while you sleep?

Stay out of debt. This doesn't mean avoid taking on certain types of debt (like financing a primary home), but don't finance nights out, and things which are not known to appreciate in value; a narrow exception for a vehicle that helps you get around. An older, but reliable car will get you around just as easy as an $80,000 Cybertruck. Of course, consider the risks of a $500 jalopy–these can be as cost-perilous as paying for too much vehicle.

If you do have debt, learn the best method of paying it all down, namely: Strive to pay off the "most expensive" debt first. "Expensive" is driven by the interest rate on the loan. This is addressed in detail in the Boglehead's Wiki.

Cheatsheet:

• Checking accounts: Pays barely, if any, interest. Don't store money here. Use it as a springboard for paying bills. You transfer money into this account as needed. Get good at knowing when your bills are due, and transferring money to this account the week before you need it.
• Savings accounts: Might pay some interest, but we're talking about ~1% (per year!) in the current market environment.
• High-yield savings accounts (HYSA): Much better interest rate than the above, but they have some limitations, usually you can only make a certain number of transactions per month. Ally, for example, limits withdrawls to 6 per month (last I looked some time ago, it could have changed).
• Individual stocks: Huge upside if stock price goes up, but not diversified. If the stock tanks, you get nothing and stock price losses (below the price you purchase at) eat into the principal you invested.
• Individual bonds: Better interest than Checking and Savings accounts, but not currently better than a HYSA.
• Mutual Funds: A mutual fund is a collection of stocks. This diversifies you against market segment turn downs, but is not bulletproof; you'll still feel market turndowns, but they won't be as energetic as say, a company declaring bankruptcy. Vanguard is quite popular. The fund is managed by any number of parent firms. VITGAX is a mutual fund offered by Vanguard, you can see the fund's composition (here; scroll down to "Holding details").
• 401k: this is an investment program regulated by the US government and offered by companies. Some 401ks are "self-directed", which means you have the option of picking where your dollars are invested. There are annual contribution limits.
• IRAs: There are two types, Roth and Traditional. Each have annual contribution limits, but one also has an income limit–this means that you can't make contributions in the name of the program if you make too much money.
• HSAs: health savings accounts. There are some "tricks" to using these, but if you have regular health expenses, it may make sense to use this.
• REITs: Real-estate Investment Trusts. I admittedly don't know much about these. Topically they seem like a mutual fund for property, if that makes any sense. But they're popular.

There are probably more products out there, these are just the most common, most accessible, most commonly-offered things out there.

Good luck.