first lesson is one of okw weak point is infantry blob specially usf.
but u can deal with them with mech or medic.
if u comfortable with medic use flak ht vs usf blob (but flakht suck solo,put it behind your infantry wall and make roketten as fast as u can). soviet t1 weak vs flakht but if u see cons spam be carefull about flak ht or u can skip it and make more vetren infantry like fussilier g43 (blob vs blob).ifu saw maxim spam just make more volks from begining and try flank them by nade.about guard spam , obers are good but u can also use fussiliers .