Newspaper reports are usually based on facts. Even so, different writers will see the same story from different points of view (bias). It's always wise to compare several different reports if you want a balanced view.
Adverts, brochures, leaflets and posters have a definite point of view (bias). They want to sell you something, so they're only going to tell you good things. Watch out for exaggeration (making things sound better than they actually are)! They often show you something positive - but it has nothing to do with what's being sold. They just want you to think about nice things when you think about their product.
When reading adverts, always ask yourself what the writer hasn't told you about the product, and whether what they are writing about is really anything to do with what they are selling.