When a drum is properly tuned, it produces not just impact sounds, but notes (each drum has its own note pitch). For some drummers, it becomes a melodic instrument. It is up to each drummer, when tuning, to determine a global tone according to the style or sound aesthetic you want to produce: high (jazz), medium (world, pop...) or low (rock, metal...). To tune the toms together, you can follow harmonic intervals.
Major tuning: bass tom: root / medium tom: major third / alto tom: fifth Minor tuning: bass tom: root / medium tom: minor third / alto tom: fifth
Octave tuning : bass tom : root / medium tom : fourth / alto tom : octave
Feel free to try other intervals, experiment and rely on your ear and your playing comfort. The bass drum and the snare drum generally accentuate the backbeat, the groove. But you can also integrate them in your harmonic interval (Example: snare drum: seventh / bass drum: octave below). The diameter of your drums, their depth, the type of wood or the type of drumhead you use will have a considerable influence on the final result. All these parameters must be consistent.