Beware of toxic teas! Tea terminology and which brands are safe!

I will explain the meaning of different tea terms. What are the healthiest types of tea and which to avoid! There are a lot of toxins in tea (some popular brands)!!! I found a list of non toxic tea.
https://mamavation.com/product-investigations/hidden-ingredients-in-tea-you-wont-find-on-the-label-safe-toxic-teas.html