My first 2 cutting boards walnut end grain

50x35x5.2 cm | 35x26x5.2cm | Dark walnut end grain cutting boards which i eill receive in near future (3rd one is in the making also) can someone point me to a guide or give me some tips on how to care for them, i also bought Howards butcher block conditioner and cleaner by same brand and they work wonderfully on some other wooden pieces which i have used them on.