Depending on the source of traffic you are looking for, you can easily select different search engines like Bing. If you are planning to launch your YouTube channel then you can select it and find the keywords ideas. Similarly, you can select eBay or Amazon to understand for product-related terms. For app store related search, you can select the Playstore option.
Apart from this, you can select Instagram or Twitter to get the list of popular hashtags or profile names with the seed keyword. By the way, if you want to filter the big list of keyword results shown up in the keyword tool, you can make use of the two features available in the tool Filter Results and Negative Keywords.
When you want to pick the keywords with a particular phrase or word Filter Results feature should be used. In contrast, when you want the list of keywords without a particular phrase or term Negative keywords feature can help you with this. This way you can save time instead of trying to filter them one-by-one manually.
Even though you can get hundreds of keyword ideas for free, you must upgrade to their PRO version to see the data such as CPC, search trends, etc of a keyword. However, you can easily export or copy the keywords to the clipboard for analyzing the keywords further in some other tools.