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From my point of view MOz is the best tool for DA and PA checking.

From my point of view:

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We use the Google disavow tool to remove the bad or spammy link form the website.

MOZ is the best tool to find the DA and PA of the website.

I agree with RH-Calvin that alt tag is very important for any website because it help search engine crawler to read the images properly.

Limitation of title tag is about 55 to 60 character and the Description should be 155 to 160 character.

Best SEO method is to do proper optimization of the website like meta tag, h1, content optimization according to keywords etc. And after that qualify off-page work like article submission, social...