buying in stocks online is not like shopping at your local major retailer, where prices are set. Because investments are priced in real time through active bidding between buyers and sellers, there are techniques to buying. you have five main ways to buy or sell them online:

1- Market orders: This is the most common type of order. You tell your broker to sell your shares at the best price or to buy shares at the current price. Because these orders are executed almost immediately and are straightforward, they typically have the lowest commissions.

2- Limit orders: With a limit order, you tell your online broker the price you’re willing to take if you’re selling stocks and the price you’re willing to pay if you’re buying. The order will execute only if your price is reached.

for example, If you want to know how to buy shares online in Facebook stock

1) You Need To Open An Online Discount Broker Account
The first thing you need to do in order to buy it (or any stock) is to sign up and open a broker account. It can all be done online and will take approximately 30 minutes.
2) You Need To Fund Your Account
3) Waiting For Your Account To Be Funded
4) Buying Facebook Stock

how to buy shares online

Advisory
People who are not so confident might prefer to take advice from the stockbroker. If you choose an advisory service, the firm will offer investment guidance, in line with your goals and attitude to risk as you set them out. The final decision, though, is up to you.

Execution only
There are three different types of stock-broking service. If you are comfortable making your own decisions and want to take control of your share trades, then you can probably opt for a DIY stockbroker, often referred to as ‘execution only’. You then decide what shares to buy and when.

Share certificates
Nominee accounts are popular because they are convenient – and fast. But if you prefer to hold paper share certificates in your own name, then you need to select a certificated account. Bear in mind, though, that the trading process could take a lot longer.

Cost of buying shares
You can start trading as soon as you put money into your account, which must often be with a cheque or debit card. But it’s important to fully understand the costs involved with buying shares. The stockbroker will charge a commission for each deal, which can be a flat rate or a percentage. The rate of commission will depend on a number of factors, including the type, size and frequency of the transaction.

buy shares online can be a good way to make a return on your money, but it can be less rewarding if dealing costs are through the roof these alone can snack a sizeable chunk off your investment returns.
This guide tells you everything you need to know about buying, holding and selling shares. Plus the cheapest way to buy them and some tips for those who are new to investing.
If you’ve had your eye on Royal Mail shares, or have always fancied investing in Marks & Spencer but you’re not sure where to start, the good news is that buying shares is not complicated.
The easiest and cheapest way to it is online from what’s called a ’share dealing platform’. These platforms allow you buy shares from any company listed on the stock exchange and various overseas exchanges.
There’s the main – the London way, 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.
Companies get listed on the S.E after they have completed an Initial Public Offering, a process which basically takes the company from being private to public – allowing others to eventually in it.