I've just noticed that many newcomers to the stock market are still confused about Bid and Offer, which are fundamental concepts if you want to trade seriously.

Simply put, Bid is the highest price a buyer is willing to pay for the security, and Offer is the lowest price a seller is willing to sell for. Both numbers change every second based on supply and demand in the market; they are not fixed figures.

Why should you care about this? Because it indicates the volume in the market, the strength of trading, and most importantly, it helps you make better trading decisions. When you place a market order, you will get the Offer price if buying, and the Bid price if selling. The difference between these two prices is the spread, which is an hidden cost in each transaction.

When looking at a chart, observe how wide the Bid and Offer are. If Bid is narrow and Offer is narrow, it means there is a trend but volume is still low. If buying continues steadily, keep an eye on it—when volume increases, prices often move further.

In the case where Bid is narrow and Offer is wide, it’s an interesting signal because it may indicate that large sellers are preparing to do something. The Offer price will keep rising while the Bid remains narrow.

Conversely, if Bid is wide and Offer is narrow, it often occurs at the end of a trend, where prices tend to move less. When both Bid and Offer are wide, that’s the period of highest volume. If this happens at the start of a trend, prices may rise further, but at the end of a trend, caution is advised.

A simple example: Suppose you want to buy Stock A, and the latest trading price is $173. But when you actually buy, the system tells you that you pay $173.10. The increase is because you paid the offer price, not the last traded price. This difference goes to the broker or market maker.

An important point is that the Bid price is always lower than the Offer price because sellers expect a higher price when selling, and buyers want to buy at a lower price. A narrow spread indicates good liquidity, while a wide spread may suggest poor liquidity or market uncertainty.

In large markets, like blue-chip stocks, spreads are usually very narrow because of high trading volume. For smaller stocks or other securities, spreads can be wider, which can eat into your profits.

If you want to trade seriously, you need to understand Bid and Offer deeply because they are not just two numbers—they reflect the market’s sentiment, true demand, and actual liquidity. Keeping an eye on the right Bid and Offer will help you avoid entering positions at bad times and better time your trades. Practice observing this in each trade, and you will see a clear difference.