Very good advice @achim03.

Research your posts well and make sure to respect a minimal quality standard: Link to the sources of the images that you use, use titles, subtitles, quotes and make it look nice.

There is a misconception that linking to the source of the images automatically saves you from copyright infringement. This is not so.

Unless an image is in public domain or you have a right to fair use, you have to assume that the image is copyright protected. For such copyright protected images, if the terms of the copyright says you can use the image but must provide a link to the source, then you provide a link to the source to comply with the terms of the copyright.

Some copyright owners may place their images in 'public domain' and ask for a mandatory link or an optional link.

I have seen so many people providing link to the source of fully copyrighted images in the belief that they are protected by doing so. Most of the time the copyright owners do not initiate an action either because they are not aware of the infringement or because they are not bothered to initiate action against every Tom, Dick and Harry. But you will never know when they might do so.