If you are looking for public opinion/polls on a topic, you might want to begin with searching on the Pew Research Center website to begin with (see link below)
Pew is non-partisan and has public opinion on many different subjects. To browse, click on "topics" on the site.
To search for a specific poll question, for example, a question about climate change, follow the link below and type in "climate change" and search:
If you do not find what you need there, see the links below for more sites to search.