Don't trust the lingo...'clean, natural, green, non-toxic' - it can all mean nothing; it's really hard to know who to trust since there's no regulation on using these words.
Unless you are really interested, most people do not have the time or interest in learning all the 'bad' ingredients. There are so many ingredients that it can be overwhelming (and certainly too much for us to get into in this guide); to top it off, it's not even always as easy as just knowing the ingredients to avoid.
Make sure you know what you actually want!
Some people have no skin issues to solve so may only be looking for clean/natural products, while others may also need efficacious products to solve a particular skincare concern. Before buying, ask yourself if you're looking for clean and natural skincare only, or are you also looking for a product to help a particular skincare issue?
Note - 'Clean' and 'Natural' are actually different, but the terms are used synonymously - natural ingredients are from nature while clean ingredients are those that are either from nature or from a lab, but are not harsh or toxic. Years ago any ingredients that were made in a lab were 'undesirable' - and while that's often still the case, some brands are creating synthetic ingredients that are not made from nature but are still very beneficial to the skin. It's a personal preference what your comfort level is - do you only want to use ingredients that come from nature or are you okay using ingredients as long as they're clean? Do you need ingredients/products that help solve a particular skincare issue? Your trusted source for products should be able to help you find the right skincare choices once you're clear on what you want.
There are MANY amazing companies & brands that sell truly clean products.
Find one (or a few) that you feel are transparent, honest, and best of all, effective, to get the skin you deserve.