How to set timing marks when changing the timing

There is a DOHC or SOHC (double or Single overhead cam engone. Both are Similar. Both have a notch on back side of crank pully that aligns with a tab on engine just above crank pully looks like a triangle with the tip near crank pully is rounded off. SOHC engines have an arrow on cam pully that aligns with a point at top of timing belt rear housing. about straight up at top of it. DOHC have an I and an E on the cam pullys I for INTAKE and E for EXHAUST. the I and E match up at same type points on top of rear Timing belt housing. When installing belt make sure you do not move pullys. put belt on starting with cam shaft (s) then down to crank on tension side which looking at motor will be the right side or Clockwise direction keeping it tight no, or EXTREEMLY little slack. then back up around tensioner. Tensioner should be the last pully to go around. Once on make sure timing marks still lline up.Adjust tensioner and. rotate engine BY HAND 4 times and re check marks.