If you are just getting started then a lot of websites will be hugely overkill - most are anyway, whatever your goal.
For most beginners I would recommend:
Replacing soft drinks/sugary drinks with water
Cutting out takeaways/sweets/crisps/cakes
Walking 45 minutes a day
Give it 30 days and you will see a huge difference.
Most people start by completely changing their diet, cooking completely new things and embarking on daunting exercise routines. It not surprising most people fall off the wagon within a few days. With the above it's not a huge change or shock to the system but you are consistently consuming fewer calories while burning off more - you can't really sell it as a course or ebook though so there are not many websites offering it as a solution.