This is where you’ll find appropriate tips:

Swift fingering and double tonguing

Practice the intonation – alone or in a group

This is how a flute works

The ears, our greatest teachers

But I Practiced It A Thousand Times...

Scales "You Can’t Live Without Them"

The Metronome - Your Friend Indeed!

Tongue Movements

In-depth Tongue Training (Part 2): Strength or Endurance?