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The easiest way to tell if your grout requires sealing is to look at it. If it looks dirtier than normal or the grout gets dark when wet, chances are the seal has broken, and resealing is necessary.

Yes. While you can clean every room in your home with vinegar and baking soda, you should not use them on marble floors. Vinegar is too acidic, and baking soda is too alkaline; both of them can lead to etching on your marble. A pH-neutral cleaner is your best bet to clean marble floors.

The best method for keeping your grout clean depends on the level of staining or discoloration. For light cleaning, use warm water and a stiff brush (specifically made for cleaning grout). 

Tougher jobs call for a one-to-one solution of white vinegar and water in a spray bottle. Spray the area down, wait 5 to 10 minutes, then scrub with your brush. For even more cleaning power, add water to baking soda until it creates a paste and apply it before the vinegar. If the mess is too much, you can call a local tile and grout cleaner.

You should not use caulk as a direct substitute for grout, but it can be used as a temporary solution to fix minor cracks. Caulk is more flexible and doesn't dry as hard as grout, making it suitable as a supplement or for small repairs. To do this, first remove the old, cracked grout using a grout or rotary saw. Then, apply a matching caulk to fill the cracks, smooth it out, and let it cure. The curing time will vary, so follow the manufacturer's instructions; a full cure can take up to 48 hours.