These plates illustrate the fact that microorganisms are everywhere and can grow under favorable conditions. Fuzzy things are molds. You will frequently see molds that are green, black, or white. Some molds are good, like the Penicillium mold that provides us with the antibiotic, penicillin. Some molds produce toxins that can make us very sick.
Some molds make our food look, taste, or smell bad.
Blobs that aren't fuzzy may be bacteria or yeasts. Some yeasts are used to make foods, like the yeast that makes bread rise or the yeast that turns the sugar in grapes to alcohol in wine. Each blob is a colony. Each colony is made up of millions of individual cells. Note the different colors and shapes of the colonies.