all convertible bonds

Hi all,
My chemistry teacher is very vague in explaining things and I don’t quite understand his method behind saying that covalent bonds are week, I thought they were very strong..
I always thought in terms of strenght it was:
covalentmetallicionichydrogen bondingdipole-dipoledispersion forces or am I way off?

I also have difficulty trying to identify network solids and metallic bonds at times, are there any tricks to remembering them?

I wish my chemistry teacher would be better at explaining this stuff….

Thanks so much for any input!

convertible bonds