You are **working** with a **platform** where users can **like** or **dislike** various **posts**. Each post has a **unique identifier**, such as `post:1`, `post:2`, `post:3`.

The **task** is to build a **system to track reactions** on multiple **posts** by randomly adding **likes** and **dislikes**, and then **displaying** the **total count** of reactions for **each post**.

1. Create **3 posts**, each with **two counters**: one for **likes** and one for **dislikes**. For example: `post:1:likes`, `post:1:dislikes`, and so on;

2. Use the `INCR` or `INCRBY` **command** to add **likes** and **dislikes** to **each post**. Add **3 likes** and **2 dislikes** to `post:1`, and **5 likes** and **1 dislike** to `post:2`;

3. Use the `DECR` or `DECRBY` **command** to **decrease** reactions for some **posts**. Remove **1 like** from `post:1` and **2 dislikes** from `post:2`;

4. Use the `GET` **command** to retrieve the current number of **likes** and **dislikes** for each post.

The **expected result** should look **like this**:

```
Post 1: 2 likes, 2 dislikes
Post 2: 5 likes, 0 dislikes
Post 3: 0 likes, 0 dislikes
```

Create **counters** for **likes** and **dislikes** for **each post**:


```redis
SET post:1:likes 0
SET post:1:dislikes 0
SET post:2:likes 0
SET post:2:dislikes 0
SET post:3:likes 0
SET post:3:dislikes 0
```

Add **3 likes** and **2 dislikes** to `post:1`:

```
INCRBY post:1:likes 3
INCRBY post:1:dislikes 2
```

Add **5 likes** and **1 dislike** to `post:2`:

```
INCRBY post:2:likes 5
INCRBY post:2:dislikes 1
```

Remove **1 like** from `post:1` and **2 dislikes** from `post:2`:

```
DECRBY post:1:likes 1
DECRBY post:2:dislikes 2
```

Retrieve the **current number** of **likes** and **dislikes** for each post:

```
GET post:1:likes
GET post:1:dislikes
GET post:2:likes
GET post:2:dislikes
GET post:3:likes
GET post:3:dislikes
```

This course will introduce you to the fundamentals of Redis and its use in real-world applications. We'll cover key Redis commands, data types, key expiration and transactions, as well as how to integrate Redis with Spring for efficient data caching.

This section provides an introduction to Redis, highlighting its core features and common use cases. You’ll learn how to install Redis on different platforms, including Windows and macOS, and get familiar with the basics of connecting to and starting the Redis server.

Here, we explore the essential Redis commands for managing and manipulating data effectively. You'll learn how to set, retrieve, increment, and delete data using commands like SET, GET, EXISTS, INCR, DECR, and tackle practical tasks to apply these concepts in real-world scenarios.

Here, you will learn about key Redis data types, including Lists, Sets, Sorted Sets, and Hashes. You will explore their functionality and practical applications through focused exercises designed to reinforce your understanding of each data type.

You'll explore advanced features of Redis, including managing key lifecycles, executing transactions, and leveraging the Pub/Sub messaging system. Additionally, you'll learn essential security practices to safeguard your Redis environment against unauthorized access.

This section introduces the fundamentals of caching and demonstrates how to configure Redis as a cache in a Spring application. It covers key caching annotations and practical examples of caching queries in web applications, concluding with a summary of the main concepts.

Challenge: INCR and DECR

Awesome!

Challenge: INCR and DECR