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Linear algebra is a specific field of study in math involving vectors, or lists of numbers representing a point or direction in n-dimensional space, matrices, which can be thought of as a list of vectors, and the relationships between them. Linear algebra is used very heavily in the field of engineering, because vectors and matrices do a good job modeling stuff in the real world like velocities, voltages, and more.

Analysis is a broad field that discusses theory of things like functions, derivates of functions which you may have discussed in Precalculus or Calculus in high school, and integrals of functions which tell you the area that sits under some function when you graph it.

Discrete math is the study of discrete functions. Discrete means that a function can only spit out certain numbers, like whole numbers, for example, a function that tells you the number of TVs bought from a store for a given day. These functions have unique properties to what are called continuous functions, which is why discrete mathematics is a separate field.
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