Climbing grid is to practice finger flexibility, generally used for finger-playing, classical, and some solo, generally playing and singing words, practice chords enough. To practice basic skills, you can practice repeating boring things. There are 24 basic transformation methods for climbing a grid. Each string can be played once or for a long time. Then, for example, you can add notes to play: 1.234; 2.345. Anyway, how to be boring is basic skills. For example, playing scale 3456712345432176543, has been repeated. Then switch scales and play this every day. It’s really not easy to practise basic skills well. It’s a very dull process.