I have started learning for Level 1 Model builder certification. While going through the training it says in middle at times to refer to Anapedia for more details. So do we have to immediately go and refer to anapedia or can we complete the full training and whenever needed we can keep referring to anapedia.
Agree with @einas.ibrahim. Try not to think of Anapedia as a requirement but rather a resource you can always refer to anytime you need a refresher or just a little more detail. As you progress with your Anaplan journey I guarantee you'll be grateful for the Anapedia. Most software companies (for profit) don't share these kind of details. Plus, you've got a great Community Site too. You'll find there are lots of people very anxious to see you succeed.
If you are new to Anaplan, you may find Anapedia "dry" which what you expect from technical documentation. Be patient and don't give up. The more you get used to Anaplan and understand it's "lingo", the more valuable you will find Anapedia.
Good luck to you on your Anaplan Journey
Einas "Give a Man a Fish, and You Feed Him for a Day. Teach a Man To Fish, and You Feed Him for a Lifetime"