Yes. Let’s clarify what can be done. The tabs you see across the screen on your navigation bar can be hidden/removed or re-ordered. We cannot add tabs that don’t exist. Watch this video to learn more:

On each record (example: Contact) – we can hide/remove fields, or add your own custom fields if there is something you want to track for that Contact (most commonly people add Linkedin Profiles or a way to Categorize their contacts by type such as prospect, client, owner, tenant, etc..). Another record frequently altered is the Property record. There are over 200 + fields on there. It’s great if you want to track all the nitty-gritty details, but if you don’t you can hide or collapse the details. 

You could also re-name some of the tabs. As long as the spirit of the data is the same, there is no harm in renaming them (Example: Some people like to re-name Accounts to Companies).