It's vague but "eat less, move more" really does work. The hard part (at least for me in the beginning) was figuring out how to apply that. Basically, any consistent change in either area will result in weight loss. It's about eating less and moving more than you currently do now. "Now" is the baseline and changes to it will get results.
I was pretty sedentary when I started losing weight a few years ago. So I put exercise into my daily routine, walking to and from work. That totaled 3 miles and 45 minutes. It was a pretty convenient way to "force" myself to exercise. Over time, I fell in love with the way being active made me feel and started pushing myself further and craving even more intense exercise. But those initial 1.5 mile walks twice a day were enough to help me drop serious pounds because it was more than I had been doing and I did it consistently.
I also started eating less. That was a process and I used various techniques at different times. A huge help for me is I cut back on sugar. I didn't do that to deliberately lose weight. I did it because I was starting to feel sick after eating lots of sugar--dizzy, cold sweat, just really cr@ppy. So I cut back on sugar to avoid those really unpleasant symptoms, and when I did I eat sugar, I always paired it with protein and/or good fat. For example, if I ate a cookie, I always had a glass of milk with it. I lucked out and not only eliminated those horrible symptoms but I got a wonderful side effect--a way less demanding appetite. I imagined my new hunger was probably what a "normal" appetite was supposed to feel like.
With a much more manageable appetite, I was able to try methods for eating less. I did different things at different points in my process. I ate frozen meals to get used to smaller portions. I got smaller plates. I imagined how much I'd normally serve myself and then took about 25% less. I started paying attention to which foods helped me feel full and ate them much more often (yay good fats, protein, and fiber!). That last one--paying attention to how foods affected my appetite--helped me a lot. I cut back on the foods that revved up my appetite. I made it a rule to eat at least 5 servings of veg and fruit every day. I found some healthy, low calorie foods that I looked forward to snacking on, like homemade kale chips and other roasted veg. I sometimes let myself go to bed slightly hungry. I drank enough tea to fill Boston Harbor. I kept bags of frozen veggies I love on hand so that when feeling lazy with a wicked case of the munchies, I could eat one of those, add a drop of olive oil or butter and maybe some parmesan or some hot sauce, and not do much caloric damage. I still often ate for pleasure, stress-relief, and fun, but I treated my diet like balancing a checkbook--I had to budget.
I know it can seem daunting at first. You can do this!