There's kind of a myth among beginners that is good enough to find some popular rutines over the internet (from some respected virtual trainer perhaps) and stick to it. Let me tell you, you're wrong in so many levels.
While those routines can be perfectly fine in general, none of them max out your potential, or take into account your current capabilities, disabilities, and so on. In simple words, they aren't customized. A routine made for "everyone" is also a routine made for no one specifically.
Since this is a broad topic, and every person is a world (and every trainer has his own preferences) you should study what's best for yourself, with the aid of written and video materials you could find easily and with zero cost. Is not enough to known that you're doing an exercise the right way, you should know why you're doing it (and not another) and what to expect from it.
Lets see this in a more practical way: you know cardio is good and you want to do some cardio routines. But how much is good for you? How intense should your cardio be? Is it right to do it whenever you feel like it? That's going to help you to reach your targets?
Doing cardio is raising the heart rate (that is, the beats per minute). The heart is the one that pumps the blood and the blood carries the oxygen, so when you do cardio you increase the circulation and the work of the lungs. But doing too much cardio is bad, first because the body gets used to everything and you will end up needing more and more cardio, in an endless spiral, and second because when you do too much the body starts to eat the muscles to get energy.
Doing over an hour of cardio a day is excessive and harmful. If you're underweight or your diet is bad even 45 minutes of cardio can be too much for you. Try to see how you feel with 30 minutes. Doesn't matter your internet routine says 45. Lower the intensity, a good trick is if you can talk while doing it, intensity is moderate enough and won't harm you. That's why i mean by "customize" your training.
Is cardio the only thing your plan has for the day? If you're lifting weights, cardio should go after. The body uses glycogen for energy and when it runs out it uses fat. If you do the cardio first you eat the glycogen and not the fat and you will have less strength to lift weight. The other way around is perfect because after you have depleted glycogen then you burn fat with cardio.
So, final words, always study your routines, what you're doing and why, possible alternatives, consult real trainers about your real conditions and whats better for you and remember exercise is a marriage with healthy diet (I'll comeback later with some hints about this).
That's all folks, see you next time...
And what about crypto training 😎