Did Beethoven have any strict teachers if yes who?

Yes, Beethoven had strict teachers during his formative years. His first notable teacher was Christian Gottlob Neefe, who was demanding and helped shape Beethoven's early musical education. Later, Beethoven studied under Joseph Haydn, who was known for his rigorous teaching style, but Beethoven's strong personality sometimes led to clashes between them. These experiences contributed to Beethoven's development as a composer and musician.