How did Boba Fett escape the sarlacc pit?
Boba’s armor offers him strong protection against the acids inside the Sarlacc’s belly. Sarlacc digested its victims very slow. It could take a sarlacc over a millennium to digest a victim. Boba wakes up inside the sarlacc’s belly and finds himself caught in its internal parts. He tries to find a way out and switches on the light in his helmet. As he moves ahead, he spots a dead stormtrooper whose armor is still intact.
Boba gets to the storm trooper and draws from its oxygen supply. Stormtroopers carried oxygen tanks on their backs with 20 minutes of emergency supply. Following that, Boba uses the flamethrower to light up the inner belly of the sarlacc and it helps him make some more space and get out of there.
Boba Fett does not crawl out of the sarlacc’s mouth but avoids its long and pointed teeth and busts out from under the sand near its mouth. Sarlaccs are nearly immobile creatures and cannot move to get to the prey. Outside the sarlacc pit, Boba lies in the scorching sun and faints a few seconds later. The rest of the story including Jawas looting his armor and the Tuskens holding him captive follows from there.
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(Boba escapes the sarlacc pit - Read more here: https://www.moviemagical.com/what-happens-in-the-book-of-boba-fett-e1s1/)