I found this site which generat's addresses and private keys according to your random characters you choose ! now my question can i use these
address and private keys to save bitcoin or it must be generated by the used wallets ,i hate wallets because the store my private key far from me ...can we use it for other cryptocurrency other than bitcoin?? this is the site
http://royalforkblog.github.io/2014/08/11/graphical-address-generator/ There are tons of sites which do exactly this, such as
https://www.bitaddress.org/bitaddress.orgAlso, any normal software wallet such as electrum gives you access to your private keys.
These keys can be used for anything that uses the same private key derivation as bitcoin, so bitcoin cash for example.
I would recommend to generate it offline, and to read through the generation code you just linked, as i'm not sure how authentic it is, ( and it also seems quite dated (2014,) although that shouldn't be a problem