Thanks for your answer

In fact position sizing depends (notably) of stop loss that’s why all is included in Money Management

Today I did a lot of trials about Money management and notably the risk reward ratio and it appears that it depends on stop loss. With the same strategy sometimes you have better result with 0.25 ratio and sometimes 2 or 3

Agree with you I did many trials with MAE/MFE but find nothing very interesting

With the Van tharp method you can find on Internet you take a trade with always the same amount. For example you say you will put 100 USD on each trade and you just have to calculate the number of lots who depends on the Stop loss you want to. Every trade win or lose the same amount. So if you have a good system it works well.