Are you looking for a quick and easy way to make money? If "yes" then you need to buy shares. Why? Because if you know how to deal with them you are going to make a lot of money only sitting and watching some digits.
Shares are an easy way to make money but this domain is so risky. You can buy shares at any time if you have already some money but nobody can guarantee you that you will make a big profit from the begining. You may lose everything from the start.
My advice: go and learn something much about this domain, learn how it works and how you can use it. If you do that, you win.

A share is simply a divided-up unit of the value of a company. For example, if a company is worth £100 million, and there are 50 million shares, then each share is worth £2 (usually listed as 200p). Those shares can and do go up and down in value for various reasons.

Companies issue shares to raise money and investors (that’s you) buy shares in businesses because they believe the company will do well and they want to ‘share’ in its success.

There are two options when buying shares, you can either:

1. Own shares yourself; or

2. Pool your money with other people in a collective investment known as a fund
For first-time investors pooling your money is a slightly safer option as you’re not putting all your eggs in one basket (as you’re not just investing in one company) and it means you can ride out any bumps in the market.
The easiest and cheapest way to buy shares is online from what’s called a ’share dealing platform’.
There’s the main stock exchange – the London Stock Exchange, where you get a whole host of companies including the really big players such as Marks & Spencer. Then there’s the Alternative Investment Market (AIM), which lists smaller developing companies that you may not have heard of.