eating before shachris
Orach Chaim 89:3 and 4
one whose hunger or thirst would affect his ability to concentrate on his prayers. the rambam explicitly states that one who is hungry and feels that he will not be able to concentrate should eat before praying
So, eating before praying is not unique to Chabad – as demonstrated above, it is normative Jewish law. Nevertheless, it is more prevalent in Chabad because in Chabad it is traditional to study chassidic teachings before the morning prayers,
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seudas shlishis
Minhag Chabad is to make sure to taste something for Shalosh Seudos, they don’t wash for bread because of the Posuk “Hayom Lo”.
What this means is as follows: The Gemarah in Shabbos learns out the obligation to eat 3 meals of Shabbos from the following Posuk: “And Moshe said, eat [the Monn] today (Hayom), because today (Hayom) is a Shabbos for Hashem, today you will not (Hayom Lo) find [the Monn] in the field”. Since the Pasuk says the word “Hayom” 3 times (when speaking about the Monn which served them as bread), we learn that one must eat 3 meals on Shabbos.
Based on the words of Rabbeinu Bechayei the Tzemach Tzedek rules (Piskei Dinim Chiddushim on Rabbeinu Yerucham p. 357) that since this meal is learned from the words “Hayom Lo”, unlike the first two meals which are learned from the word “Hayom”, we don’t need to eat bread for Shalosh Seudos, unlike the first two meals
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davening late
nothing to do with chabad, sorry.
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not Learning Mussar- or ANYTHING that isn’t Chassidus
where did you got such nonsense from