both bookmarks and passwords can be exported to a file. That file can then be imported to another pc. transfer it with a flash drive or something. I'd not recommend emailing it to yourself.
once on the new system you can simply import it. Those files can also be imported to other browsers as well. the process is identical just maybe different menu locations to do it.
in Opera, click Menu, down to bookmarks then on the flyout click import/ export depending on your needs.
passwords is somewhat similar. Open the password manager. on the left click settings then import or export based on your needs.
sorry the reply took so long, I just joined this forum and im under a 10 minute wait between posts.