Expertise in both digital marketing and web analytics. I have experiences working with multinational brands on their web report analysis and marketing effectiveness.

Goes without say GA is the best free tool available.

Here's the general process I recommend:
1. Understand business goals and objectives - who is this report prepped for and for what purpose? what kind of website is it?

2. GA Audit & Setup - most people ignore this step but its actually very critical because if you find out the site is not tracking critical information, any data you pull from it will be skewed and unreliable.

3. Determine KPI which addresses your objectives. - different objectives will result in the need for various KPI. But in general, conversions and transactions are always on the list.

4. Digging into data to find insights. - using segmentation & filters to gather specific data which can provide very specific insights. (too often people fall into the trap of high level KPI which offer little insight or actionable next steps)

I'd be more than happy to hop on a call to help you figure out these targets and work through.