Looking forward to download a multi crypto wallet for my smartphone and I heard there is open source and closed source wallet, can someone explain to me what's the difference between the two and which one is more safer for a crypto newbie?
euhm..... An open source wallet is open source, a closed source wallet is closed source...
Open source wallets CAN be peer-reviewed, their sourcecode is open, so anybody can review it... This does not mean that every open source wallet was reviewed by somebody knowledgeable. It also means that a hacker has an easyer job in finding vulnerability's.
On the other hand, closed source wallets can contain backdoors or vulnerability's that nobody finds because it's closed source.
I guess, in general, it would be better to pick a community-vetted open source wallet... Do your own research: it's not because it's in the play store or in apple's store that it's safe!!! There are several wallets, for example f-r-e-e-w-a-l-l-e-t, that are rumoured to pay people for good reviews in google and apple's store, but still rob you blind if you use them.
There's open source vs closed source, but just as important are custodial vs non-custodial wallets (tip: if you have the choice, pick the non-custodial wallet)