Long easy what am I riddles

My skin is green and slippery. I have four legs and webbed feet. I eat bugs and little fish. I can swim under water and hop on land. I am a...

I have wings but I'm not a bird I am small and colorful. I live in gardens and fields and forests. I used to be a caterpillar. I am a...

We can be boring, Or interesting. We can be long, Or short. We can have pictures, Or just words. Many love us, But many also hate us. What are we?

I am a home of knowledge, both banal and profound. In grand halls and small homes I can be found. I am a home for things of many leaves, but my many residents are not living trees. What am I?