I think the songwriter is the person who writes lyrics for the songs and the composer is the person who writes the music.
Film language is the way that filmmakers tell their ideas and emotions to the audience through the visuals, dialogue, and sound. It is the tool used to tell a story and convey a message on the screen.
Cinematography is not an easy career path. But you end up working with big names in the industry, which is different from a typical 9-to-5 job.