about  False Positive vs False Negative):  I think that that the choice should match the goal of our Model or application. For example if it is about coronvirus or other task of medical diagnosis, The Goal is to detect the maximum of positive cases (having the illness), in this case we should focus on False Neagtive (False Positive doesn’t matter, even if the model predcit healthy subjects as ill: it is not very dangerous). but if it is about detecting credit card frauds(for example): yes,we should focus on the False Positive (because we must be careful not to calssify a non-fraudulent(negative) case as fraudulent(positive)).