the first code is P0300, which i understand is a missfire code, so im gonna check my plugs and if its not them i'll just have a tech do some diagnostics on my ignition/fuel systems

the other code im a bit worried about is P0315 which im told is a crank sensor code, both these codes came at the same time while warming up my car this morning, is it normal for both these codes to show up due to the same problem or do i have 2 seperate issues? possible bad crank sensor? or are these just normal codes that pop up every now and then like bad maf readings, any help/input is greatly appriciated