Question: I keep seeing 

> 
> (not provided)
> 
> 
> 

under my 

> 
> Keywords
> 
> 
> 

section so I'm unable to see what people are searching for when Googling my website.

I had a friend say for me to click 'Search Engine Optimisaion > Queries' in Analytics and then link it to Google Webmaster Tools.

I did this a few days ago but I'm still getting the '(not provided)' problem.

Do I need to do something else?

Answer: 
What you did was connecting the Search Console to Analytics. Here you get the Search Console Analytics Data in Google Analytics, but under a new Tab:

[![enter image description here](https://i.stack.imgur.com/IQ8KW.png)](https://i.stack.imgur.com/IQ8KW.png)

The Problem here is, that you don´t see the behavioural and transaction-Metrics for this Keywords (you even don´t see which Keyword rankt to which page). 

As other mentioned the Problem is here Google Secure Search Update in 2011. Also Bing started 2015 to deliver the search results in https so you get less and less Keywords here.

There are some workarounds with filters for this <https://blog.kissmetrics.com/unlock-keyword-not-provided/>. But this are just "workarounds".

To get a idea of the Keywords a User googled to come to my pages i use <https://keyword-hero.com/>. They match the Keywords quite well. I test it now since ca. 3 weeks and it looks like this:
[![enter image description here](https://i.stack.imgur.com/hdA7H.png)](https://i.stack.imgur.com/hdA7H.png)

You can also use the Search Console itself to get an idea of the Keywords user googled, i thinks its the best source for this.
As mentioned in some of the other answers, Google intentionally discontinued providing keywords when someone is referred from their search engine to a result page for privacy reasons.

There is no way around this within Google Analytics. There are some other methods for best guess using Webmaster Tools as also mentioned.

Another option is to use a tool that helps to match up keywords, landing pages and search volume. One such tool is provided by Authority Labs. There's probably some other providers too, this is just the one I know and use.

You can see exactly how Authority Labs works in this YouTube video
<https://www.youtube.com/watch?v=72mLFFTAMpw>