For most of the pieces, they are expected to be used like anything you'd buy in a regular store. Feel free to throw them in the dishwasher, microwave, or however else you use your ceramics.
For crackle pieces, they have been treated with Liquid Quartz Sealer and should be fully food, microwave, and dishwasher safe. Crackle glazes do compromise the integrity of the ceramics so they will be more fragile but not in a significant way that should affect everyday use.