I wanted to plug
MyFitnessPal, or basically some kind of system for tracking your diet that's easy to use and to take with you. I upload to MFP mostly through my computer, but I've got the app on my phone too.
If you're trying to lose weight, you'll have the best success of taking a slow and gradual route. Don't starve yourself. Don't skip meals. Don't set unattainable goals either like going zero carbs or fat or drastically cutting back on everything you enjoy eating. Rather, you'll want to test out and implement gradual eating improvements; between those and exercise, you'll want to take in 500 calories less per day. That averages to one pound of weight loss per week. I know that "500" sounds like a mentally huge number. Remember that reduction comes from changing how you eat
and burning additional calories through exercise.
Weight training can burn calories you take in and, as your muscles grow, will burn more during rest periods. That said, if you're trying to bulk up in a significant way, the advice to eat more (generally) and increase protein intake may offset fat-burning weight reduction.
Trust me. I've been there. I put on a lot of fat and weight after finishing my doctoral degree. I lost quite a bit of weight through participating in a
Couch-to-5K program. I felt so good about finishing the 5K that I got complacent with exercise. Covid hit; I went to the gym for a minute, then worked out at home for a while, and I've been trying to find an exercise program that works for me. There's a
lot of information online, so much so that it may seem overwhelming. I've been there too.
So, for now, my annual check-up informed me that I need to focus more on what I'm eating than exercise. Hence, I'm back to MFP but am eager to try new and healthy food habits. Good luck to you too, OP.