I know we can learn financial management through management courses or we can learn informally through our experiences or common sense. But applying financial management skills is by choice, it's not enough to know how to plan your finances and how to make feasible budgets for it, what matters is applying it. What you know doesn't matter so much as what you do with it, knowing that you should live bellow your means (earnings) yet you spend everything is poor management. Without discipline you cannot save and invest, no matter how much you earn you can blow everything if you don't have focus.
Financial management centeres on having budget for your total income, what is not in the budget is either carried forward or cancelled. Budget helps you to spend within your planned expenditures, if you must add something to your expenses outside of your budget it means that you have to remove something from your budget. You need to priotize your needs to know what will go into what you earn and what doesn't, it helps you to spend prudently. Yet knowing all this things is just theory if you don't have the self control to practicalize them, you need to be very disciplined about financial matters if you must succeed financially.
I don't understand. One can or will apply what they know, right? So if someone has knowledge of financial management, they will surely be able to manage their finances properly by creating a budget based on their income and then spending what they earn based on that; one will not be able to keep up with the budget they have created if they lack financial knowledge or have zero financial management skills, but if you have gained enough knowledge and understand how things should be done, you should have no problems at all.
Most of the time, it's actually not a lack of financial knowledge that makes a budget not manageable, it's actually a lack of funds, because most people are usually employed, and they get a salary at the end of the month which is not more than enough, obviously, so it becomes very difficult for them to run the month with a fixed budget because if you don't even get to fulfill the basic necessities of your household properly with your income, you can't make and follow a budget and expect the things would get better.