I could just give you my sixteen tips as an ordered list and be done with it.  But I think you should first be confident you are ok with the principles below, as your weight loss target will be half reached if you are completely happy with the theory underneath.

The infamous equation

This equation regulates mass exchanges in your body, whether you like it or not, for the simple reason I did not come up with it myself, but common sense and biology came with it (not always the case that these two get along, but it is often the case, often enough to have led to the human species actually).

Cut the c . . . what are these tips?

Input

Your body does not generate energy by itself.  It transforms the energy contained in food and drinks (except sugar-free drinks), most often using oxygen in the air you breath, to produce a number of by-products, including, but not limited to, heat, and physical work (i.e.  muscle contraction, allowing you to breath, make your heart beat, stand, walk, run, jump, and so many other things we cannot quote here).
Input is the only tap that you could have virtually full control on if your will allows.

Output

At the other end of the chain is output, which I think is the tap you have the least control on, as society, work, roster, will, weather, and a lot more other factors have got control over too.
Output is the total energy your body cells produce.
Some of it is simply used for the“infrastructure”, as in makes your own body work.  You really need this one, and you should not attempt to control the infrastructure needs (such as complete food deprivation for long periods, > 6 hrs, starvation diets, drastically hypocaloric diets).
Typically the output energy is heat to maintain your body temperature to 37°C (downwards or upwards by the way, sweating or producing heat inside); it is also fundamental muscle contractions to breath, make your heart beat, move your limbs, think, make your organs perform their job.
Another output energy is the untransformed energy, that is still“potential” as physicists say, but did not get a chance to yield anything, because your body simply rejected it, or let it through untouched.  I am thinking of vomiting, or eliminate through natural ways for all sort of reasons, e.g.  disease or sickness.
Hypothetically, I will here consider this“untouched output energy” component is negligible or null.

The extra work

The rest of the output energy that is part of the total energy is the extra physical work component you can make your body do without really needing it to live or survive short-term, such as sport! Or simply walk to the movies, run before work (or after!), do push ups, ride a bike instead of driving a car, use the stairs instead of the lift, well, all the activities that you could really live without on an hospital bed for example . . .
Remember that“optional extra work” will make a meaningful difference long-term, when you are in the second part of your life, therefore increasingly lose its“optional” qualification, and could well determine then if you live or survive . . .
The latter component, the extra physical work, is a tap that you sort of control; however, there are a lot of factors that, in modern life (as opposed to caveman life), are limiting this control.
e.g.  hard to go for a 5 hour bike ride in the mountains to stay fit when you have to run to school to pick up your kids after work and have to go and buy food to cook and feed them.  The only thing you want to do next is go to bed before . . . doing it all over again the same day.

Replace hunting

To add a bit of difficulty to the whole story, in its biggest unfairness, life made it so that the less extra work you put and the less fit you will be, the more in pain you will be, the less shiny your skin will appear, the more your back will hurt, the more you knee will deteriorate, the shorter your life expectancy will be.  Basically the less healthy you will be.  Overall, the less seducing power you will have, because let’s face it, this is all what the original aim of life is, isn’t it? Humans too do mate when they mutually find themselves attractive, a but like wildlife in fact.  Especially humans do that actually, although they complicated the story by adding other down-to-earth sufficient conditions to mate, such as material rules . . .

I was mentionning unfairness, In fact I think it is fair.  It made it to make the fittest survive, at the time where you actually had to run and be clever to catch that injured wild deer or something to hunt, take it back to the cave, and clean it and cook it to feed your family and older relatives who could not make it anymore.
In today’s life,“thanks God” some will say, we don’t need to run after deers to survive.  Modern life created both an exceptionally high quality of living in the material world, and an exceptionally poor quality of living in one’s body.
Note that all the progress in health, starting with Pasteur’s work in bacteriology and virology, allowing an increasing number of humans to now live closer to 70 or 80 years old in good health, is not incompatible with a caveman style physical training, closer to bootcamp I guess.  So don’t think I want humanity to regress, but rather to replace the vicious sides of our modern life with items taken from the good side of what they had in their daily routine, such as walking long distances, lifting, running, and all sorts of physical activities.

It’s your lucky day, because you know what? Life being“good”, sometimes, it was designed to tap into your body fat (wherever it lies) when you do a moderate intensity physical activity.  I am not talking about weight lifting at the gym here, or running like a hare ou riding up a mountain.  I refer to active walking, slow running, or even 3 hrs of exhaustive housework! In technical terms, we say that the fat channel is being activated when one exercises at around 70% of their maximal heart rate.  If you haven’t understood anything to that phrase, no worries, just remember that "long (several hours) yet moderate activity taps into your body fat."

Achieveable goals

Aware that the component I called the extra work is harder to have control on because of lack of time or resources to do it, I wrote this article with in mind the normal people, where I define here as normal a working person with just a little time in their life to do sport, because they do have other priorities, whatever they are.
Therefore my tips do not require more time, but rather a different approach to perform tasks you anyway already do.  This allows me to call these goals achievable.

The unfavourable context

My sixteen tips below have worked for me.  I did not have a particular helpful background to help me as I am the type to quickly put on weight if I do not follow any particular diet other than eat balanced and drink water only with meals.  I know people who can eat whatever they want in whatever quantity and still not put a single kilo on.  One of them even desperately tried to put on weight as he thinks he is too slim, and never managed to do it.
Please consider if my tips can apply to you, based on your own way to consider yourself and the image you want to give to your own eyes, to others eyes, and the lifespan in good health you are targeting.