Before we carry on - I think you have the guitar upside down. Not in reality, but in the way you name the strings. The thicker strings (usually higher placed on the guitar neck) are actually those that produce the lower sounds. That's where the root and bass notes are played.
So - each ordinary chord, like simple majors and minors, have three notes. Because the guitar normally has six strings, those notes can have duplicate note names an octave or two apart.
Let's take a simple E major chord. The three notes that make E are E G# and B. It really doesn't matter too much how many of each note are played, or the order they're played in. But for a beginner, the usual way is to play a root E on the fat string (the lowest sounding/ highest placed). On 5th string is the B, (2nd fret). Then another E 2nd fret 4th string. There's no G# yet, but that can be reached on 3rd string, 1st fret. So now we have all three notes needed, but two strings left. The thinnest ones. It just happens that they are left open , as they are B and E, both of which are in the E major chord. Job done!
On guitar, often (but not always) the lowest (in sound) note played in a chord is the root - a lot of guitar sites see to advocate this, although it's often not what experienced guitarists will play.
If you're asking for resources, this isn't the place to provide a route to them. But what I do with beginner students is give them note names for a chord, e.g. C, E, G, and get them to find one of each on the fretboard, close enough together to play all simultaneously. There's the chord. With this C major example, there are several ways to play the notes, using some open strings. But, as Todd says, that's what guitars are about - there often isn't just one shape, but a few available, and that's without moving everything around the fretboard. So don't expect to find a small list of chord shapes. Having said that, there are 'standard' shapes that everyone knows and uses - part of the 'caged' system is built upon them.