Hi @ly3j, Can you please update your post with some more information so we can help you faster? Things like screenshots and your environment info really speed things up.
Posting guidelines can be found here: Posting Guidelines for the Design Help Category - General - Forum | Webflow
(1) You can use the undo function when making small errors (http://help.webflow.com/general/designer-user-interface#undo-redo-and-save)
(2) You can access your site’s previously saved versions from the Backups tab in your Site Settings
(3) You can use Symbols to make your navigation work across all sites. http://symbols.webflow.com and http://help.webflow.com/features/symbols
(4) You can reuse classes on any elements, but may need to check for inheritied styles. Try clearing unused styles to keep your classes clean and organized
Thanks in advance! 
PS: Also, these resources may be helpful:
- We have great tutorials and are only coming out with more everyday to help teach web design: http://tutorials.webflow.com/
- We recently started hosting workshops/webinars to help teach web design: http://webflow.com/workshops
- We have lots of documentation on how to use Webflow, learn webflow best practices and more: http://help.webflow.com