Which of these android wallets( Mycelium,Electrum ) is best used to store bitcoin?
For storing Bitcoin? Neither. For using with a small spending balance both are good.
Which wallet is suitable for beginners?
SPV: Electrum, Mycelium.
Full Wallet: Bitcoin Core.
So sorry for this for such a primitive question, just do not know how to start
Then don't ask questions, and start actually doing research
yourself?