Short answers, pulled from the story.
Johannes Brahms was born on the 7th of May 1833 in a poor apartment in the quarter of Hamburg. He grew up in cramped conditions while his father Johann Jakob worked as a double bass player and hornist for the Hamburg militia.
Johannes Brahms studied piano with Otto Friedrich Willibald Cossel and later studied with Eduard Marxsen from 1845 to 1848. He made his debut at ten years old playing Beethoven's Quintet for Piano and Winds Op. 16 along with an étude by Henri Herz.
Robert Schumann published an article entitled Neue Bahnen in the journal Neue Zeitschrift für Musik on the 28th of October 1853 that nominated the twenty-year-old Johannes Brahms as someone fated to give expression to the times in the highest manner. This praise aggravated Johannes Brahms's self-critical standards and dented his confidence.
Johannes Brahms never married perhaps in an effort to focus on his work as a musician and scholar. He supported Clara Schumann's household after Robert Schumann attempted suicide in February 1854 and they remained close lifelong friends after Robert's death in 1856.
Johannes Brahms laboured over his First Symphony for almost fifteen years from about 1861 to 1876 though he had begun it as early as 1855. The work appeared in 1876 and when premiered in Vienna it was immediately hailed as Beethoven's Tenth.
After thinking he might retire from composition following the successful Vienna premiere of his Second String Quintet Op. 111 in 1890, Johannes Brahms wrote the Clarinet Trio Op. 114 and the Clarinet Quintet Op. 115 both in 1891. His final works included two Clarinet Sonatas Op. 120 in 1894 and the Vier ernste Gesänge Four Serious Songs Op. 121 in 1896.