Wash the knife with warm water before using it for the first time. After each use, make sure to wash the knife without delay (with a simple detergent) and dry it with a soft cloth. Especially if you have cut acidic foods, you must wash the knife immediately after use.

For your safety, you should always wipe the knife away from your body and away from the edge, with a cloth or towel.

It is not recommended to wash it in the dishwasher but by hand, in order to protect its material and maintain its sharpness for a long time.

No matter how sharp a knife is initially, after some use it needs sharpening, which you can achieve with a sharpener, whetstone, or honing rod.

You can tell if your knife cuts well with an easy test using the knife and a sheet of paper. A sharp knife can easily and cleanly cut through a sheet of paper. Conversely, a knife that needs sharpening will struggle and the cut will be jagged. 

It is also recommended to occasionally have your knives sharpened by a professional to repair any potential damage to the blade's edge and to maintain sharpness.