How do you make a minor chord into a major chord? I can't seem to find any information online for this. Just learning music for the first time so i'm pretty clueless
To a beginner it can be confusing. Understanding even what a chord is!
To a lot of us, a basic chord - the one most used in music - is called a triad. It contains (no surprise) three notes. Let's take a scale. C major will do. C D E F G A B C.The triad that makes up C major chord is 1,3 and 5 of that scale. So, C E G are the notes making up C major.
Let's now consider the C minor scale (the first 5 notes will suffice). C D E♭ F G. Again, using the 1, 3 and 5, we have C E♭ G. The difference is the middle note. In C minor, it's E♭, and to get C major, that note is raised by a semitone, making it E.
It can be confusing in other keys, so let's look at D. D minor has D E F G A at the scale beginning, so Dm chord is D F A. D major has D E F♯ G A, making 1 3 and 5 D F♯ A. Again, the minor 3rd note is changed for the note a semitone higher (from the major scale), and F changes to F♯. D>F♯ is called a major 3rd, for reasons given earlier in this answer.
As Albrecht points out in his answer, major refers to the larger interval between notes 1 and 3, whereas minor refers to the slightly smaller interval between 1 and m3 in the minr scale. Erroneously, some think of major as more important, and minor less so. Not so - it's down to size.
What does minor/major mean?
Always try to understand the etymology and the roots of terms.
Looking up wikipedia they explain that major means large and minor small. This makes me assume that in English beginners of music are not always taught or later they aren’t aware that this is concerning the lower third of a triad. In German we would call these thirds big (major) and small (minor).
A major chord is a triad built on a root tone, a large third and a small third. Together they build a perfect fifth.
To get a minor chord you simply have to “lower” the middle tone of the triad 135 by adding flat (b3) or solving a sharp (#3) the latter into a natural third. By this third 1 - 3 becomes small and 3 - 5 will be large:
Now we have triad built by a minor third (below) and a major third (above).
Now I see I‘ve explained the opposite that you have asked. Never mind! Just do the opposite - reverse process - by raising the middle tone of the triad and you‘ll get a mjor chord from a minor.
You have to understand that a minor triad is made of the first (root of the chord), flattened third and perfect fifth notes. The tonic chord in a minor scale, accordingly, would comprise of the 1st, 3rd, & 5th degrees of the minor scale (E.g. the chord Cm is [C Eb G], derived from the key of C minor: [C D Eb F G A♭ B♭ C]).
To make a minor chord into a major chord, you can find the third note and raise it a semitone back to being the third note of the major scale i.e. Eb (of C minor) raised by a semitone would become E natural. This gives the C major triad (chord), which will be C E G.