actually i am a teacher of junior maths, my students are mainly 13-14 years old

i need to teach a topic on factorization

but my students really can't master well with it.

I don't even think I explain to them very clearly, so I understand I have a problem, as a teacher

I can only push them to do more exercise and practice

but I really can't think of any skills or quick tips for them

can any one suggest how to teach factorization??