I would like to convert all articles to seblod. I see this extension Seblod Exporter : https://www.seblod.com/resources/extensions/add-ons/seblod-exporter
Should i export all articles and import again to convert?
If you have just few articles you can open them and save them again, this should convert them to seblod. Otherwise you will need to use some 3rd party tool to export Joomla articles to csv and then import them back using Seblod importer.