We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

Investing fundamentals: how I learned to stop making costly mistakes

Investing fundamentals are the rules we learn when we first start investing to stop ourselves from making costly mistakes. Here are the lessons James Reynolds has learned.

pensive bearded business man sitting on chair looking out of the window

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Investing fundamentals are the bedrock upon which all successful investors build their strategies. But too often new investors are unaware of some vitally important basics. They get caught up in the excitement of what they’re doing, unaware that they’re only one bad call away from losing a lot of money. I know, because I’ve been there.

News is behind the curve

It’s critical to be informed about current events and what’s going on in the world, but only up to a point. The problem with paying too much attention to the news is that it can lead me to invest reactively rather than strategically, putting me behind the curve.

XXX

One of the worst blunders I ever made was purchasing stock in a firm that had recently hit the headlines because its stock price had skyrocketed. Shortly after I did, the price plummeted which was, once again, all over the news. I panicked and sold, only to watch the shares rebound in price. The whole ordeal just raised my cortisol levels and cost me money.

Nowadays, I listen to the news, but I don’t let it drive my decisions.

Investing is a marathon, not a sprint

Two powerful emotions, fear and greed, have the ability to influence everyone in the world. 

When the market falls, fear motivates us to sell, while greed pushes us to buy when prices are at all-time highs. But as shown above, I might as well burn my money if I don’t keep my emotions in check.

What I’ve learned to keep in mind is that investing isn’t about becoming a millionaire overnight. It’s all about long-term wealth creation.

Buying stocks and virtually forgetting about them was the smartest thing I ever did. Prices will continue to fluctuate in utterly unexpected ways for years, but I realised that devoting my days to watching them would just weaken my resolve.

Research the business

The fundamental investing rule I now have is to research a business. It takes little time or effort and that research might be the difference between a wonderful return and a huge loss. Of course, I need to know what I’m looking for, so I ask myself four key questions.

  • Does the business provide a product or service?
  • Is it costly to operate?
  • Does the company have a competitive advantage over similar businesses?
  • What’s the profit margin and does it have a lot of debt?

Most of these questions can be addressed by reviewing a company’s financial statements. If I can’t find satisfactory answers, I usually decide it’s not worth the risk.

No one’s making me swing

There isn’t a timeframe to any of this. Investing icon Warren Buffett once compared picking stocks to batting in a baseball game. Bu there’s one important distinction: there’s no one making me swing. This means I can truly think about chances that comes my way and don’t have to actif I’m not 100% sure it’s a smart bet. Ok, I’ve missed out on some excellent investments, but that’s not a problem. There will always be more chances, more opportunities. And when it comes to my hard-earned cash, I’ve learned it’s better to be cautious.

All investment entails risk, but by focusing on these fundamentals, I’ve stopped making the kind of costly mistake I mentioned above.

James Reynolds has no position in any of the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »