4. Wallet with private keys/backup features? this is also one of the desiring features one can sought for, in this category HD wallet is considered.
Newbies should not be confused with this private key and seed phrase backup feature, it only means that the seed phrase and private keys generated by reputable hardware wallets are generated offline in a way it is yet practically impossible for online attack to extract the seed phrase and private keys.
Seed phrase should be well backup on paper, laminated paper or metallic sheet offline in a way it will be resistant to offline attacks. Two replica is necessary for backup in different locations.
5. Bitcoin only supporting wallet? here are some of the best suitable bitcoin wallet you could use, mycelium wallet and electrum wallet.
I will prefer Electrum because it has more features like:
- lightning network
- coin control
- address freeze
- Can be used on airgapped devices for cold storage
- Can be used as watch-only wallet (watch-only wallets can not be used for spending, only for tracking transactions)
Coin control can aid in maintaining privacy. Mycelium wallet support ethereum and ERC20 tokens, I read about that, you can correct me if I am wrong about Mycelium wallet supported coins.
6. Bitcoin and multi currency wallet? in this category we have trezor and trust wallet.
Trustwallet is close source wallet, there is nothing worst than that, the reason it is better to go for hardware wallets that support altcoins for altcoin purposes.
7. Best wallet suitable for beginners: Exodus wallet and some mobile wallets.
Do not always believe what you read online, Electrum is still easy to use for beginners.
For privacy, Bitcoin Core, using it with Tor.