I want to know how to import my "Bitcoin Charity Address" in Electrum or in Bitcoin Core. I have downloaded Bitcoin Core and Electrum but I cannot run a full Node as I have no funds to down load the whole 500 GB data for lack of funds. I am stacked downloading upto 2018. So I have turned off my PC.
Use Electrum then, it is "light" so you don't need to download the whole blockchain, just the block headers which is about 56 MB and syncs fast. All you have to do is to create a new wallet and in the wizard window select "Import bitcoin address or private keys" option and in the next window enter your private key to import it in your Electrum wallet.
As a prerquirement you must educate yourself about security, even cold storage and if you can you should buy a hardware wallet to make things easier and safer with little effort.