Other than the Cakewalk FAQ, are there any specific sites or blogs that explains in details about using FX plugins like compressions, distortions and delays? 

Your best bet is to head over to Groove3.com and check out their videos. I recommend the Compression and EQ explained. There are lots of other videos as well. $15.00 for one month all access.

Caveat: I own none of these plugins...
 
http://www.fabfilter.com/
This site has some really great videos for explaining how various fx can be used. They'll make you drool for their versions, but other versions do the same thing.
 
There are tons of great videos you can buy from Sonar. I think I've watched them all.
 
Craig Anderton has a book on Sonar for Guitar, which is a little dated but still cool.
 
Of course, the Sonar Power books deserve a mention.
http://www.garrigus.com/
I have 2 as hard copy (Sonar 7 and Sonar X1 maybe?) and since I've been using my Safari Books Online subscription to read and search them.
 
There is also aggregated Cakewalk content here...
http://www.cakewalk.com/CakeTV/SONAR-University
 
 

Good articles on compressors:
http://www.soundonsound.com/sos/sep09/articles/compressionmadeeasy.htm
 
http://www.soundonsound.com/sos/may08/articles/mixcompression.htm
 
http://www.soundonsound.com/sos/1996_articles/apr96/compression.html
 
 
Delay:
http://www.soundonsound.com/sos/may12/articles/designer-delay.htm
 

There are plenty of good videos on the Cakewalk blog site etc.  Some good stuff.  Basic, but then that is what you are talking about.  Groove3 has great "how to" videos that are more in depth.  Sound on Sound has plenty of free articles on line - it is just the stuff in the last 2 months that is restricted.  But a subscription to them is worthwhile if expensive.  Tape Op doesn't do any "how to" articles but is good stuff, too and the price is right - free.
 
Effects of all kinds are cool, but the icing on the cake - not the cake itself.  I'd worry more about the basics of recording and mixing before I start in on the gravy.
 
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Head over to iZotope and check out their Mixing Handbook. Even without owning a single iZotope plugin this is like a primer on the very subjects you asked for.

https://www.izotope.com/e...all-product-resources/

Here's an online magazine that's always jam packed with general audio info. Look around.

http://en.audiofanzine.co...for+January+31%2C+2015

http://www.cambridge-mt.com/ms-ch9.htm

In addition to the earlier recommendations, there are plenty of free video tutorials on YouTube.  Search 'audio compression' for example.

i would recommend this:
 
http://www.amazon.co.uk/Mixing-Audio-Concepts-Practices-Tools/dp/0240520688
 
And this:
 
http://www.amazon.co.uk/Behind-Glass-Record-Producers-Craft/dp/0879306149
 
And this:
 
http://www.amazon.co.uk/Mixing-Secrets-Small-Studio-Senior/dp/0240815807
 
And of course this:
 
http://www.amazon.co.uk/Mixing-your-Mind-Closely-Engineering/dp/0646428756
 
 

Check out the following blog:
 
Soundonsound - I strongly recommend this if you're just starting out (and even if you're not). It explains almost anything and everything regarding audio. You will definitely not regret spending time there. It is a really, really well-rounded source of information for all things audio/music production and it's free. They also have a magazine which is also great and they regularly post articles from the magazines.
 
There is so much information out there and I think a resource like this could definitely help you because it compiles so much information into one location. It will save you time and also keep you away from all of the distractions.
 
I can't post links yet, I don't think, so just search soundonsound and you should find it.

 Here are a few links into SOS that BelAmine just mentioned :
 
 Advanced Compression Techniques   (old)
 
Compression Made Easy   (2009)
 
Parallel Compression   (2013)