Still more questions I see often:
What does it mean when I buy a stock and it goes down immediately? Should I sell it?

If your stock drops substantially, it might be worthwhile to reexamine your investing thesis regarding that company. Did something important happen—a big lawsuit, a change in business strategy, executive leadership fired or departed, a new and daunting competitor—or is it simply the market getting worried about something small, like an unusually bad earnings report or a rise in inventories? If something substantial has taken place at the company that makes you question the future of the business, you could sell and chalk the whole thing up to a learning moment. But if it’s a smaller thing you probably want to just ride it out.
Why is it a big deal that the Fed might raise rates? What does
that mean and should I worry?
The Fed is the Federal Reserve, a government body which tries to
manage the supply of money in the economy in part by raising and lowering the
Fed Funds Rate—an interest amount banks charge one another to borrow money held
at the Federal Reserve. This rate has been effectively at zero (.25%) since
late 2008, in the depths of the great recession.
In the short run, raising the fed funds rate tightens the money
supply by making it more expensive for banks to borrow funds to lend, and that
makes the loans then made by those banks more expensive. Which means it costs
more for people to borrow, which generally slows buying behavior, which slows
the rate of the rise of stocks and can cause a few days of market price
declines. Raising the fed funds rate is a slow-motion braking system for the
economy.
Historically speaking, the current rate is absurdly low. It must
come up sometime or the Federal Reserve has no levers it can pull to loosen the
money supply, a necessary ability. Ultimately, businesses and individuals will
continue to borrow to buy equipment and materials, to hire and train workers,
to buy buildings, and so on, regardless of the borrowing costs. People adapt.
So in the long run, raising rates generally means nothing.
What is the greatest stock purchase you’ve ever made?

At about $119 today, Apple has been better than a 200-bagger for me over that period. And while I've sold shares off periodically over the years to rebalance my overweighted portfolio, I never sold it all. The argument can be made that that one success has made possible much of the rest of my portfolio over the years. Certainly it showed me the rewards possible from investing patience.
What is seed investing? How is that different from venture
capital? Can I buy stock in a company that has not “gone public”?
Seed stage is the first outside money to be invested in a
company—when the founders discover they’ve tapped their own savings, credit
cards, home equity and relatives’ generosity to the breaking point and they
want early investors to help fund the company’s growth. Seed investment is
extremely high-risk, because a failure of the business in the future means
those investors lose everything. By the same token, of course, it can be highly
lucrative if the company succeeds. But even then the investors rarely see their
money for several years or longer.
Venture capital—VC—is the next stage of outside financing in a
young company. VC funding usually comes with strings, such as strategy advice,
leadership/management assistance, seats on the company’s Board of Directors,
and so on. VC firms are professional investors who are well-financed, generally
well-connected, and experienced in getting small upstart companies from seed-stage
to the next level, where the business can be sold to a larger firm or taken to
the stock market with an initial public offering, or IPO.
Shares of seed-stage and VC-backed companies are generally unavailable
to most people. Those shares are held by the founders and those early
investors, who tend to be wealthy, experienced investors who both fully
understand the risks and illiquidity of private stock ownership and who can
afford the losses which frequently result.
I’ve read
about companies lately splitting their shares into two different classes of
stock. What does that mean?
This is the new trend. It’s confusing for existing shareholders
because the new shares trade under different ticker symbols and at different
prices. But what’s happening isn’t really all that important or exciting for
most of us.
Basically, a company splits shares to make them appear more
affordable to a broad range of potential buyers: “Why spend $100 for a piece of
the company? We’ll do a 2-for-1 split and they’ll only cost $50!” But you’ll
get half as much ownership, so it doesn’t matter. But the different-classes
splits we’re seeing lately do something else: they divide voting shares held by
management (and existing shareholders) from non-voting shares which can be
bought and sold as well, usually at a small discount. It’s simply a way of
having shares split without diluting the voting shares crucial for founders and
executive leadership to execute their will, which as an investor is a good
thing.
If you’re deciding which class of shares to buy, it comes down to
whether you prefer the small discount (usually 5-10%) that non-voting shares
provide, or the right to vote your shares—in a company which millions, or
hundreds of millions, of outstanding shares.
What is
an appropriate amount to keep in cash as I manage my investment portfolio?
As a rule of thumb, I try to keep about 10% of my investment
portfolio in cash. Warren Buffett has called this “dry gunpowder”—the cash needed
to be able to take advantage of surprising market opportunities, such as a
sudden price drop on a particularly great company. It’s also just a good habit
to hold a little back for rainy days.
What represents a
great buy today?


Also great buys today are those firms I consider to be “forever
stocks,” the ones you can buy today and probably forget about for 20 or 30
years. When you look up in the distant future (or your newborn nephew is told
he has stock you gave him decades before), these well-run, long-term managed
companies will likely still be doing well. These companies provide a product or
a service that will likely still be valuable then as it is today: Disney (DIS),
Starbucks (SBUX), even Ford (F) and Hershey (HSY).
