Hi Is reading the reference manual of the Cortex M4 required to learn stm32f103 ?

[Tesla DeLorean · Accepted solution]

Well reviewing the CM3 TRM, or one of Joseph Yiu's Essential series books will provide context for the ST Reference Manual.

S​T has a Programming Manual.

[Tesla DeLorean]

https://www.st.com/content/ccc/resource/technical/document/programming_manual/5b/ca/8d/83/56/7f/40/08/CD00228163.pdf/files/CD00228163.pdf/jcr:content/translations/en.CD00228163.pdf

I'll note I came here proficient in C and ARM Assembler. If you have familiarity with other micro-controllers the path will be easier, the CM3/CM4 are an evolution over the earlier ARM cores.