True and False,
The main thing is what you mean when you say 'you want to lose weight'
Do you want to lose both MUSCLES AND FAT or JUST FAT.
If you want to maintain your muscles or even grow them and then lose fat at the same time, you need a PROPER DIET AND WORKOUT PLAN, designed for it.
CARDIO IS RUBBISH AND USELESS, in fact it ACTUALLY SLOWS DOWN FAT LOSS AND KILLS MUSCLES MASS, due to the slowing of your metabolism.
I always advise against it, i lost all my fat doing heavy lifting and gained muscle mass at the same time.
There is a huge DIFFERENCE between AEROBIC and ANAEROBIC workouts, Where AEROBIC WORKOUTS USE OXYGEN TO FUEL YOUR MUSCLES, ANEROBICS USE GLYCOGEN WHICH IS THEN REFUELED WITH TRIGLYCERIDES FROM YOUR FAT STORES. This is why diet is VERY VERY IMPORTANT, because IF YOU EAT TO MANY CARBS, YOUR BODY WILL NOT NEED TO BURN FAT TO FILL ITS GLYCOGEN STORES.
Lastly, its not just about calories, ITS ABOUT WHERE THEY COME FROM, NOT ALL CALORIES ARE CREATED EQUAL.
To lose fat and maintain your muscles, you need most of your calories from PROTEIN and you will need to eliminate calories from PROCESSED CARBS/SUGARS AND TRANS FATS. There are GOOD calories and then there are BAD calories.