Hello jeenapedersen, Just a note depending on the strength training routine you can get into fat burning doing strength training.
i agree with them when it comes to trying to build muscle however if you are trying to slim down id definetely do cardio first because that will get your blood pumping and your heart rate up to a fat burning zone.
You should do strength training first! By doing cardio first you become exhausted and then doing strength training becomes difficult.
Run/ walk is cardio; squats, planks, pushups etc. are strength and toning. So you decide hich you want as a priortity because you will have more energy to put into the one you do first if you plan to do them back to back.