Poetry is a series of words, the soul, which is 'Rasa'. "Vākyam rasātmakam kāvyam."
Rīti: Rīti consists of the combination (bandha) of gunas, alamkāras and 'Rasa'. It means style or 'Sailī'. It is very essential for kāvya.
Guna: The concept of gunas in alamkārasāstra is as old as that of alamkāras, V.K in the beginning of the kāvyalaksna says "Utkarsahetavah proktā gunalamkāra rītayah".
Alamkara: Alamkara, it beautifies or decorates or adorns the kāvya. "Alamkārah kataka-Kundaladivat.".
Chhanda: The regularized process is called vrtta or chhanda. A padya or stanza consists of 4 padas or quarters. Each pada consists of a number of aksras or mātras.