Indeed GWMT is a wonderful resource to know stuff we don't know about our own site. I believe you feel better to know how to use it for your own advantage rather than giving up on it claiming it's too advanced or technical for you. It's time for us to review your site and optimize for Google search.
Remove page from search results and cache - This option will remove indexed page from Google search results including its cached version. Before you submit the request, make sure either the page has been removed from your site or blocked from search engines. Else it will be recrawled and reindexed later on.
Remove page from cache only - You already know what's the cached version of a web page by now. This option allows you to remove the current cached version of a page.
Why someone wanna remove a cached page? Good question. Imagine if a page on your site been revealing some sensitive information, but you managed to delete them today. However, still the cached version contains that specific information. Even removing the cached version will assure that no one will have access to your sensitive information by any chance too.
Remove directory - It's not about removing a single page, but a directory with multiple pages. It can be your entire site too. But you need to make sure that the specific directory or site is already blocked from search engines or no longer available online. Else they will be reindexed later on.
Once you select the relevant action for your removal request, click Submit Request button. The pending requests will be listed and displayed by default. You can navigate through requests you have made from the drop down menu on right.
<span itemprop="name">Steven Spielberg</span>
I just wanted to give you a basic understanding about how structured data types work as I believe it will be helpful. You don't need to worry about it much if you don't know about using structured data, but keep the idea in mind.