To play the E note, pick the open 6th string.
Play the F note with the first finger of your left hand behind the first fret of the 6th string.
Play the G note with the third finger of your left hand behind the third fret of the 6th string.
The Dobro is a metal bodied "Resonator Guitar". It has a resonator cone which amplifies the sound even though there are no electronics involved. There are also wooden bodied guitars with a metal resonator cone. All these guitars are great for slide and fingerpicking. They are traditionally associated with Blues, Bluegrass, Country and other Roots music.
The Fender Stratocaster is one of the most famous of all electric guitars. Designed by Leo Fender and first released in 1954, the Stratocaster (commonly called a "Strat") has been used by millions of guitarists all over the world. Some of the most famous Strat players include Jimi Hendrix, Mark Knopfler and Eric Clapton.