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Day 01 Foundations

Day 1

Day 1

~1 hour Intermediate Hands-on Precision AI Academy

Today's Objective

Install Redis, use redis-cli, and work with all five core data types.

Redis Is Not a Cache. It's a Data Structure Server.

Most developers think of Redis as a cache. It is one, but it's also much more. Redis keeps all data in memory (fast) and persists to disk (durable). It has five data structures that solve specific problems elegantly.

install_and_connect.txt
INSTALL AND CONNECT
# Mac: brew install redis
# Linux: sudo apt install redis
redis-server &
redis-cli
strings.txt
STRINGS
SET name 'Alice'
GET name

SET counter 0
INCR counter         # atomic increment → 1
INCRBY counter 5     # → 6
DECR counter         # → 5

SET token 'abc123' EX 3600   # expires in 1 hour
TTL token                     # time remaining (seconds)
PERSIST token                 # remove expiration
hashes_(like_a_row_in_a_table).txt
HASHES (LIKE A ROW IN A TABLE)
HSET user:1 name Alice email [email protected] age 28
HGET user:1 name
HGETALL user:1
HMSET user:2 name Bob email [email protected]
HDEL user:1 age
HEXISTS user:1 email
lists,_sets,_sorted_sets.txt
LISTS, SETS, SORTED SETS
# Lists (ordered, allows duplicates)
LPUSH mylist 'a' 'b' 'c'    # push to head
RPUSH mylist 'd'             # push to tail
LRANGE mylist 0 -1           # get all
LPOP mylist                  # pop from head

# Sets (unordered, unique members)
SADD tags python javascript rust
SMEMBERS tags
SISMEMBER tags python        # 1 if member
SCARD tags                   # count

# Sorted Sets (score + member)
ZADD leaderboard 100 alice 85 bob 92 carol
ZRANGE leaderboard 0 -1 WITHSCORES
ZRANK leaderboard alice      # 0-based rank
ZREVRANK leaderboard alice   # rank from top
📝 Day 1 Exercise
Build a Leaderboard
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What's Next

The foundations from today carry directly into Day 2. In the next session the focus shifts to Day 2 — building directly on everything covered here.

Supporting Videos & Reading

Go deeper with these external references.

YouTube
Day 1 — Video Walkthroughs Community tutorials and walkthroughs covering the concepts in this lesson.
→
YouTube
Day 1 Explained Deep-dive explanations and live-coding sessions from top educators.
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Official Docs
Official Documentation Primary reference documentation for the technologies covered in this lesson.
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GitHub
Open Source Examples Real-world codebases demonstrating the patterns taught in this lesson.
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Day 1 Checkpoint

Before moving on, verify you can answer these without looking:

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