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→Contributors' rights and obligations
In the first case, you retain copyright to your materials. You can later republish and relicense them in any way you like. However, you can never retract the GFDL license for the versions you placed here: that material will remain under GFDL forever.
In the second case, if you incorporate external GFDL materials, as a requirement of the GFDL, you need to acknowledge the authorship and provide a link back to the network location of the original copy. Eg, part of this text is copied from [httphttps://en.wikipedia.org/wwiki/index.php?title=Wikipedia:Copyrights&action=edit Wikipedia:Copyrights]. Adding this link makes this article conform to the GFDL license. It is however better practice to add a Links section to the bottom of your article to add this.
The contents is copyright by their respective authors, see History tab of every page for details.