I would encourage to read the Quran. Start there.

Sahih Bukhari Volume 1, Book 2, Hadith Number 24

SAHIH BUKHARI BOOK 2. BELIEF

Narated By Ibn ‘Umar : Allah’s Apostle said: “I have been ordered (by Allah) to fight against the people until they testify that none has the right to be worshiped but Allah and that Muhammad is Allah’s Apostle, and offer the prayers perfectly and give the obligatory charity, so if they perform a that, then they save their lives an property from me except for Islamic laws and then their reckoning (accounts) will be done by Allah.”

Yet Quran 2:256 states, “Let there be no compulsion in religion; truth stands out clear from error.”

Sahih Bukhari Volume 1, Book 2, Hadith Number 25

SAHIH BUKHARI BOOK 2. BELIEF

Narated By Abu Huraira : Allah’s Apostle was asked, “What is the best deed?” He replied, “To believe in Allah and His Apostle (Muhammad). The questioner then asked, “What is the next (in goodness)? He replied, “To participate in Jihad (religious fighting) in Allah’s Cause.”