<n​inoni:matrix.org> When I create advance mode instead of simple mode in the wallet the simple mode will be override and forgotten ? I will not have an access to it any more right?

ninoni you can always return to simple mode

<n​inoni:matrix.org> I see. ... but should I remember a password for this wallet or it is erased ?

the password will be unaffected by changing wallet mode

why do you want to enable advanced mode? you wish to sync your own node?

its definitely better than simple mode (which uses a random node). advanced mode lets you choose from starting to sync your own node before you are able to send/receive monero, or, (like simple mode) pick your own remote node you want to use

<n​inoni:matrix.org> I have chosen the simple mode but then by more research I found out it is not so safe like advance mode. Our IP address can be exposed and maybe other things also . My priority is to be as safe as possible then I think the best then it is to start from scratch and create advance mode .

<n​inoni:matrix.org> Do you know how much space on a disc of my computer I need for that node ?

full node is 220~ GB pruned is 80~GB

<n​inoni:matrix.org> And what is the difference ?

some info here getmonero.org/resources/moneropedia/pruning.html

<n​inoni:matrix.org> Thanks a lot 🙂 .