Welcome to this site.
Your posting is about the site SPK. Yes, everybody can make use of it (not every one can do it), and also can contribute to it. Through reading the matters appearing in the site one will get lot of information. Also through one's contribution one can share his knowledge with others.
Doubts can be cleared by reading 'Member FAQ', 'Posting Guidelines'and other related resources connected with SPK.
T.M.Sankaran
Gold Member, SPK