https://www.usacoinbook.com/coins/519/small-cents/lincoln-memorial-cent/1970-S/large-date-low-7/ There were two varieties of the 1970 S Lincoln Memorial Cent (Penny). The one depicted in the image above is the large date variety where the "7" appears lower and is not level with the "0". Below is a close-up image comparing the large date with the small date.
It's all in the 9 and LIBERTY. The 9 on the large date will point down towards the base of the 7 while the small date will point due east into the middle of the 7. LIBERTY will be well defined on the large date while it will be much less defined (soft) on the small date. Those are my go to's which takes about 2 seconds to make the determination. You will catch on with practice.
