Which is the best ICO to invest for beginner?
These are the things you can self evaluate the ICO. You will need time to learn about these. Good luck. 
+ Business Idea - Business Idea
+ Team & Advisor: Structure & Experience - The structure and experience of the DEV team
+ Prototype
+ Roadmap - A roadmap for project development
+ Token Utility: How to use, supply & demand
+Community & Strategic Partners - Community and Strategic Partners
Unfortunately, there is no such thing as "Best ICO to invest in as a beginner". You have to do a bit of a research and due diligence in order to come to conclusion which is the best. You can do that by employing the following key steps:
1. Create MyEthWallet
2. Deposit some funds
3. Do your ICO due diligence
3.1. Assess WP
3.2. Check reviews and listings
3.3. Find out if Idea & Solution are well-established
3.4. Verify that the website is ok
3.5. Check Token distribution, promos & discounts
4. ICO Stages (Private sale, pre-sale, crowdsale) - understand in which phase the ICO is currently in and understand the differences
5. KYC
6. Registration and purchase directly via their website
7. HODL or Trade
Let me be honest with you. If you are really searching for a quality material on how to invest, and what type of ICOs to choose, then go to https://www.coinpoint.net/icoguides/smart-investing-in-ico/ and subscribe to get the full Guide on how to do so!