If you need a bit of a push on a riddle, that's okay! Here are some hints
for the first chapter (Levels 1-5).
Level 1: You may recall looking at the "source" from the tutorial. Let's try that here.
Level 2: Those two colors are probably the key to the solution! Put them together.
Level 3: What is hidden is extremely hard to see... unless you use the right tool on it. Find the pattern!
Level 4: Did you find the other pages? (We call this an egg hunt.)
Level 5: Scan it! A certain part of the first image is still useful.