On Form 8949 column (f) shows all”w”s, what does this mean? Column (h) as a result is almost all zeros.

[ckpryor]

The W in column f means you have a Non-deductible loss due to a Wash Sale. This occurs when an investor sells a security and repurchases the same or very similar investment in less than 30 day.

[GeorgeM777]

Yes, those are all references to wash sales.  A wash sale disallows a loss and because it is an adjustment, it is entered in column (f) with a "w" and column (g) reflects the amount of adjustment i.e. the amount of the loss that has been disallowed.  

The loss that has been disallowed gets added to the cost basis of the security purchase that triggered the wash sale.  To realize the loss, do not purchase the same or similar security 30 days before or 30 days after the sale.  

@vantreeckdouglas