Newbie Question: Changing Themes

This is probably an idiotic question, but, having spent a lot of time setting up my site on one theme (WP 2014), I just want to know if I experiment with other themes, will all my content, settings and plug-ins etc. still be there if I return to my present theme?

I knew absolutely nothing about WP or setting up a site, so I’ve learned a lot, and would like to experiment with different themes, but NOT if I had to go through setting everything up again.

Thanks in advance for any responses.