Infantry Advice in PVP?

I've been getting better at PVP but I still struggle with some things. So far my strategy has been to open with sturmgrenadiers into heavy sturmgrenadiers squad when I can and then saving up for a panzer 4 with some scouts in between. Idk if this is a good tactic but it feels decent for the most part but I sometimes have trouble keeping my infantry alive. Tanks just feel like a vision game more than anything but idk if I position my infantry wrong or what. I try to spread them out in whatever cover I can but they often die to enemy tanks or flak and idk how to deal with it. Do I just need to smoke and run out if my infantry and being fired upon like that?