Here are some helpful videos for builders that are new or need a refresh on forming ribs and riveting. Please note that this is informational only - as all ribs are fluted, formed and lightening holes are already formed.
Note the order in which things are done. First, flanges are bent in form blocks. Second, lightening/stiffening holes are flanged. Last, the rib is fluted to get it straight.
If any of the links below do not work please visit the website here and search for the topic you need. https://www.eaa.org/Videos