Due to high % of copied text in quotes, your text scores extremely high for unoriginal content.

When using quotes you due to place the text of the quote in this form...

> text

... and make sure that you have more original text in your content, than quotes.

Online tool that would be great for you to use and the best to start with is https://app.grammarly.com/. It will correct your mistakes.

The links below are some tools that you can use for improving your post and language:

Hemingwayapp - writing assistance - http://www.hemingwayapp.com/
Paperrater - comprehensive writing tool - https://www.paperrater.com/
Reverso - spell check, tools, translation - http://www.reverso.net/

Simple table generator - various formats https://www.tablesgenerator.com/
Text decoration tool - https://coolsymbol.com/text-decoration.html
Convert Markdown to HTML - https://www.browserling.com/tools/markdown-to-html
Various tools for better writing - https://www.textfixer.com/
Words, synonyms, meanings, dictionary - https://www.thesaurus.com/
Fun stuff, learn language/s, easy app - https://www.memrise.com/