There is something very useful, I have been searching all over the site and I have not found it is the contract calculator, the opening price, the closing price, the number of open positions, the strong closing price, the number of openings, the amount of earnings and the rate of return, etc., specify some of them and ask for several other functions, should not it be commonly used?
The grassThe tutorials for reference exchanges generally have detailed instructions, and you can follow them according to the instructions you write.