A long tail keyword is a search query feat. more than 2 words, far less competitive than the head terms (one- and two-word keywords). Which long tail keywords are people using to look for something specific?
You may have noticed that Google gives you a few suggestions when you start typing a basic query in the search bar. What if you could have a longer list of these suggestions?
Don't look any further, here's an application I'm using on a daily basis: Keywordtool.io.
Type "houses" and choose Google.com / English. You'll get 700 suggestions, giving you a hint at the most used search queries. You can obviously refine your analysis with SemRush or ahrefs but it's already a very good start.
You get the basic data for free, not only for Google but also for Youtube, Bing, Amazon and even the App Store.