Hey Huseyin. Yes, the seed can be used to derive all children keys and addresses; that is exactly what this article covers. If by "seed" you're actually referring to the mnemonic/recovery phrase, see the previous article: https://wolovim.medium.com/ethereum-201-mnemonics-bb01a9108c38.

Note: if you're just looking to access a wallet that you have mnemonic words for, I'd recommend something like the MyCrypto desktop app: https://app.mycrypto.com/download-desktop-app.