Is it worth making a poster summarizing the most important parts of a Ph.D. thesis and submitting it to a conference? Is it considered an added value to the research?
Posters at conferences are one of the forms of scientific communication. Presenting as poster will give you the chance to discuss your results with other researchers in your field. However, your have to select the conference carefully. A conference with a more narrow topic can be better than one with a very broad range of topics. And avoid fake conferences where you will not meet other scientists from your field.