I am absolutely inexperienced in SEO and just started studying the subject. As one of tasks for my job application I need to analyse a website and point out 3 terms that I would like to improve rankings for. Which I believe means that I should find out which keywords most usually refer to the wbsite and which less often so could be used more frequently. I was wondering if there is any free tool that would allow me to analyse a website (not mine so google analysis is not possible) and detect which keywords usually refer audience to the website. I am not certain if there is any tool that would help me with detecting keywords similar/related to those already used on the website so that I could enlarge keyword base. Any tips highly appreciated. Probably there was a similar post to this one already so my apologies, but being so inexperienced I have even problems searching for the right topics.
Thank you very much in advance for helping me!