I wanna know how can I use hair gel to give my hairs typical style. do gels have bad effects on hair

yes, gels have very bad effects on hair. After using them regularly you can lose your hair and they can become sticky and hard. But for special occasions u can use them, I don't think you'll lose you hair only coz u used it once

I wanna know how can I use hair gel to give my hairs typical style. do gels have bad effects on hairs?

I think they do... but I ocassionaly use them.