Opening a position is the process of buying cash assets into risky assets. For example, the process of buying stocks and bonds is to open positions. Or the full name is: build your own portfolio.

Closing positions refers to selling low-risk or high-risk assets into cash or converting them into risk-free assets. This process is called liquidation.

A heavy position refers to a large proportion of high-risk assets in the total amount of funds, or a single investment target. If you are optimistic about a stock, the proportion of buying the stock accounts for a high proportion of the total amount of funds, which can be called a heavy position.

Positions are generally not used alone, such as asking "What is your position?" Or "holding positions, etc." The former means what your current asset allocation is, which funds, which stocks, etc. And what is the proportion. The latter means maintaining the current configuration, not buying or selling.

Stop loss means that when the price reaches a certain level, the behavior of automatic liquidation is stop loss. Stop loss is a way to limit the further expansion of losses, or a way to limit further profit taking.