As you might imagine, I’m a fan of the book <em>Eats, shoots & Leaves.</em>
Its is the possessive form, it's always means it is. This is an entertaining book about punctuation https://www.amazon.com/Eats-Shoots-Leaves-Tolerance-Punctuation-ebook/dp/B000OIZSVY/ref=sr_1_1?ie=UTF8&qid=1517055704&sr=8-1&keywords=eats+shoots+and+leaves
Your grammar is a good indicator of how you communicate in the real world. If you have trouble forming a cogent sentence in text where you have red squiggly lines to indicate misspelling, or clear violations of norms, like putting two spaces after a period, it indicates that your spoken response in the real world may be lacking.
Grammar is important. Like the Lynn Truss book demonstrates, there is a huge difference between the following statements:
A panda eats shoots and leaves.
A panda eats, shoots and leaves.