How to install Solr

Hello,
after spending my week reading the documentation nothing is clear, so I appeal to you.

I would want to use Solr as search engine for my website using Drupal 7.

I’ve installed the Solr search module and I’ve downloaded Solr

So, my question: How to install Solr ?
I have read the documentation and for me it’s gibberish.

So I’ll start with the principal: Where to put Solr ? Do we need put Solr files to the website root via Filezilla?

Thanks!

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