Some people think of minor chords as “sad”, but they do convey at least a feeling of seriousness or sombeness when contrasted with major chords. Watch this short video on minor chords and their character:

To build a house you need quite a variety of different materials, among which are lumber, nails, glass, roofing, cement, and so on. If you make a cake you need certain materials too, such as flour, eggs, sugar, salt and etc. It’s exactly the same when it comes to piano playing. To create a piece on the piano you need various materials such as melody, harmony, rhythm. Watch this 8-minute video on the building blocks of piano playing: