A Kabbalah literally means a tradition, Kabbalah is a tradition passed from person to person based around the study of G-d and levels of G-dliness.
In kabbalah maasis (practical Kabbalah) there methods of binding Angels by oath, making Golems, going into spiritual realms, etc.
The Arizal said that nowerdays we cannot do the last (practical kabbalah) because we do not possess the red heifer and are impure.
Tanya mentions the first type of Kabbalah, which is based around understanding G-dliness. In reality, many of the early mussar seforim are replete with quotes and explanations of Kabbalistic ideas (Reishis Chochmah, Nefesh Hachayim).