Is ablution valid with two visible braids, half of which are inside the hair during wiping, and forgetting to wipe them? And is ablution valid when wiping the head without wiping the excess hair such as a braid?

If you wipe your entire head, your ablution is valid. If you wipe only a small part of your head, your ablution is valid according to many scholars, and this is what Al-Mardawi considered correct, stating that it is the sound opinion, and a small amount is excused due to hardship. As for loose hair that extends beyond the scalp, it is not obligatory to wipe it, as it is not part of the head. If one were to wipe only this hair, it would not suffice. However, if the hair extends beyond its root but does not go beyond the area of obligation, and one wipes it, it is sufficient.