Tax advantages

Any tax write off or tips from any new laws from president? Or old laws that is good to look into.

The new tax laws will limit the amount of interest payments you can deduct up to $750,000 if you've financed your B&B with a mortgage. If you have a business loan, this limit does not apply.
Anyone who itemizes can deduct their property taxes, but filers must choose between deducting their state & local property, income taxes, or deducting their sales taxes. Again, I believe this only applies to B&Bs owned as homes, not businesses.