Piano course books recommendation

[musicallyyours]

Dear seniors, I have the following book:
Adult All-in-One Course: lesson, theory, solo. Level 3 (Alfred's Basic Adult Piano Course)

I really like it and in no time, I will complete this 3rd book. Thus, I wish to seek your recommendation for (similar all-in-one) next course books

Level / References / Objective:
Looking into something late beginner / early intermediate. To gain technique, knowledge and skills. Not limitted to any musical era / composers.

Looking forwars for your responds. Thanks a lot and good day.

[edwincurrent]

If you are serious, look into any of the conservatory piano syllabi.  ABRSM, RCM, Trinity or local options. Even if you don't plan on formal exams, the repertoires and exam requirements in each grade are very well designed. There are usually options for classical and contemporary or both.

Start with Grade 1. There may be some overlap with skills learned in Alfred but that will help you work through the first few levels faster. While building your repertoire, get really good at scales, arpeggios and chromatic runs. For intermediate level grades you need accurate 4 octave scales/arpeggios in any key with both hands in 16th note time.
Early grades need 2 octaves both hands in all keys that have less than 4 accidentals. Same for Arpeggios in all keys with less than 3 accidentals. You'll end up hating this part but stick with it and eventually you'll be using Chopin's Etudes as warm-ups.

[mrcreosote]

I think the instant reversing of the Russian style scales provide additional challenge to the brain.  Especially at speed.  Contrary motion seems to embed the "shape" or "feel" of the scale keys under the fingers.  And adds challenges to maintaining fingering.

They are harder = better IMHO