Coin collecting is a hobby that can be as casual or as involved as you choose. Many people begin with a simple set of coins they acquire from their change and continue to build on their collection over years. Some collectors are connoisseurs, pursuing only the finest examples of their chosen series. Others may have a more historical focus, acquiring coins of a specific date or type that has some personal meaning to them.
Regardless of your approach to collecting, you will find that coins are a commodity and their values rise and fall on the same supply and demand principal that affects other commodities. During times of economic weakness or uncertainty, coins tend to be less desirable as investments and will generally have lower valuations. On the other hand, during periods of strong growth and confidence, coins will usually increase in value.
The value of a coin is also greatly influenced by the popularity of a particular series. Large numbers of collectors create demand which shows up in premiums paid for coins. The overall condition of the coins in your collection also influences their value. Judging condition accurately can be a challenge, but with good preparation and organization it is possible to achieve accurate results.
Before you spend money on coins, learn everything you can about them. Familiarize yourself with their parts, inscriptions and images as well as their materials and metallurgy. There are popular coin collecting magazines, like Coin World and Numismatic News, which will help you keep up with developments in the numismatic industry. However, be careful of websites that are primarily in the business of selling you overpriced coins.