Here are some great links to help understand your data
I have compiled a list of videos that explain Google Analytics in detail. Please go through them and let me know if you have more questions or if some material is harder to understand.
Campaign URL Builder from Google. This will allow you to add UTM parameters to your URL. This assures better attribution in your Analytics tool of choice.
Google Trends. Check the keyword search volumes over time and geography to make sure that there is enough interest in them to build paid campaigns.
Learn Regular Expressions. When building segments and filters in Google Analytics or just plain coding in Python or R, you will need to use regexes. This is a good learning resource for them.
Testing Regular Expressions. When you have a huge list of URL’s and you need to find out if a particular Regex fits them all, this is a good resource to use as a check.
Google Tag Manager Resources. AnalyticsMania provides a very large resource base for building up your knowledge of GTM. I used the courses available to build up my Analytics practice.
Measure School has a set of very useful resources for Google Analytics and Google Tag Manager. They also have a login section with more goodies that they charge a nominal fee for.
Want to learn R? Well, this is a great resource for all levels of learning. This open-source statistical package is now a full-blown platform where you can do pretty much anything.