Capital gains tax (or CGT), is the tax levied by the government on the profits made from financial asset sales. CGT regulations and levels vary from country to country.

Capital expenditure, or CAPEX, is the term used for the money spent by businesses on physical assets. It’s an important part of understanding a company’s accounts.

A call option is a contract the gives the buyer the right but not the obligation to buy a specific asset at a specific price, on a specific date of expiry. The value of a call option appreciates if the asset's market price increases.

A ratio spread is a strategy used in options trading, in which a trader will hold an unequal number of buy and sell options positions on a single underlying asset at once.

Rate of return (ROR) is the loss or gain of an investment over a certain period, expressed as a percentage of the initial cost of the investment. A positive ROR means the position has made a profit, while a negative ROR means a loss. You will have a rate of return on any investment you make.

Random walk theory is a financial model that assumes that the stock market moves in a completely unpredictable way. The hypothesis suggests that the future price of each stock is independent of its own historical movement and the price of other securities.

A rally is a period in which the price of an asset, market or index sees sustained upward momentum. Typically, a rally will arrive after a period in which prices have been flat or in a decline.