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It really depends on your level of knowledge of the bitcoin protocol, dynamics and infrastructure.
Do you mean mobile?
If so, for onchain founds I would suggest Green Wallet by blockstream, just use the simple single-sig wallet amd avoid di 2FA or multisig. Off course remember that a mobile wallet is an hot wallet.
For lightning there are a lot of different solutions too, I will just name some:
  • Phoenix, non custodial and simplifies a lot of the channel backup mechanism
  • Breez, non custodial
  • Blixt, non custodial but a more 'advanced' lightning and onchain wallet
These are pretty solid solutions, there are tons of wallets, just stick with the industry standard and use the most solid and most used.