How does the movement of tectonic plates explain mountain buildings?

when tectonic plates move against each other. they smash each other and sometimes topple over each other(whether on a small scale or a large scale). You can easily visualize this if you take 2 strong blocks and try really hard to push them towards each other.

similarly,if the plates topple over each other on a large scale, then they will form big chunks or lumps of distorted rock, soil etc.

Simply put, those lumps are mountains.