A syllable (Greek: συλλαβή) is a unit of organization for a sequence of speech sounds. For example, the word water is composed of two syllables: wa and ter.Syllables are often considered the phonological "building blocks" of words.
Learn the syllable rules at here and here too.
And if you are forgetful(like me) or lazty or till you are sure of your count, use the syllable counters at Counter1 or Counter 2(this counter needs to e refreshed frequently).
ps: please do read the rules once even if you want to use the counter forever
pps: get ready for the next poetic lesson this monday based on syllable count