Put your ring finger on the 3rd fret 1st string (strings are numbered 1 through 6 starting at the bottom string and going to the top string and frets are the thin metal bars that run across the neck and the space between). If you strum strings 1 thru 4. that is a “G” chord. The ring finger is used because your other fingers will be needed to fill out the full chord. Index finger on the 5th string 2nd fret and the middle finger on the 6th string 3rd fret.
There are a lot of 2 finger combinations that sound good when you use the strings around your finger placement. If the sound is off experiment until you find a good spot. I’ll go into more chord teaching as we progress.
The second and third fingers on the second fret 4th and 5th strings is an e minor. The index finger on the 1st fret 3rd string and the 2nd finger on the 2nd fret of the 5th string is an E 7th.