diff --git a/_posts/2024-12-13-geth-command.md b/_posts/2024-12-13-geth-command.md
new file mode 100644
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+++ b/_posts/2024-12-13-geth-command.md
@@ -0,0 +1,52 @@
+---
+title: Geth 기본 명령어
+date: 2024-12-13 20:42:00 +/-TTTT
+categories: [Security, Blockchain]
+tags: [security, blockchain, geth]
+math: true
+---
+
+## Ethereum 실행하기
+
+```shell
+% geth --datadir {경로} console
+```
+
+## Geth에서 자주 쓰이는 명령어
+
+### 계좌 정보
+
+모든 계좌 확인하기
+```
+> eth.accounts
+```
+
+특정 계좌 확인하기
+```
+> eth.accounts[숫자]
+```
+
+잔고 확인하기
+```
+> eth.getBalance(eth.accounts[숫자])
+```
+
+### 계좌 잠금을 풀 때
+
+```
+> personal.unlockAccount(eth.accounts[숫자])
+> personal.unlockAccount(eth.accounts[숫자], "기존 비밀번호")
+```
+
+### 채굴
+
+```
+> miner.start()
+> miner.stop()
+```
+
+채굴 전엔 잔액이 0이었으나, 채굴 후엔 아래 사진과 같이 잔액이 늘어난 것을 확인할 수 있음.
+
+![img](/assets/img/2024-12-13-geth-command/0.png){: w="500" }{: .shadow }
+
+- 0번째 계좌만 잔액이 늘어난 이유는 기본 계좌가 0번 계좌로 설정되어 있기 때문임.
\ No newline at end of file
diff --git a/_posts/2024-12-13-install-solidity.md b/_posts/2024-12-13-install-solidity.md
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+++ b/_posts/2024-12-13-install-solidity.md
@@ -0,0 +1,32 @@
+---
+title: Solidity 설치하기
+date: 2024-12-13 19:19:00 +/-TTTT
+categories: [Security, Blockchain]
+tags: [security, blockchain, solidity, ethereum]
+math: true
+---
+
+## Solidity Compiler 설치하기
+
+npm을 이용하여 설치해보자.
+
+```shell
+% sudo npm install -g solc
+```
+
+## 프로그래밍 예제
+
+> VSC에서 `hello.sol` 파일을 만들고 프로그래밍 해보자.
+
+```
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity 0.8.28;
+
+contract hello{
+    string message = "Hello world!";
+    function showMsg() public view returns (string memory){
+        return message;
+    }
+}
+```
+
diff --git a/_posts/2024-12-13-private-ethereum-network.md b/_posts/2024-12-13-private-ethereum-network.md
index ed7a5e0..492c681 100644
--- a/_posts/2024-12-13-private-ethereum-network.md
+++ b/_posts/2024-12-13-private-ethereum-network.md
@@ -124,7 +124,7 @@ INFO [12-13|19:00:41.038] Exported existing genesis block
 ### Genesis Block 생성하기
 
 ```shell
-% geth --datadir {경로} init {json 파일 위치}
+% geth --datadir {경로} init {경로/파일이름.json}
 ```
 
 ### Ethereum 실행하기
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