Typos

Thanks for making Web Skills; it has been a great resource! I wanted to contribute at least something to the project by making this issue. If I have time later, I may be able to make a pull request for these changes. Also note that I am in no way a great English speaker, so my suggestions may be wrong. These are mostly just things that "sounded off" when I read them.

Fundamentals > HTML > Syntax Change "it's" to "its".

Fundamentals > HTML > Basic Tags Add a period for consistency.

Fundamentals > CSS > Syntax Change "it's" to "its".

Fundamentals > Javascript > Syntax Change "it's" to "its".

Fundamentals > Javascript > Template Literals Change "and help" to "can help".

Fundamentals > The Browser > Debugging Change "basics concepts" to "basic concepts".

Accessibility > ARIA Change "descriptions an labels" to "descriptions and labels". Change "help assistive technology understanding your website" to "help assistive technology understand your website" or "help assistive technology in understanding your website".

Web Components > Constructible Stylesheets Change "shadow dom" to "Shadow DOM" for consistency.

Progressive Webapps Change "API's" to "APIs".

Progressive Webapps > Loading Performance > Dynamic Import Change "javascript" to "Javascript" for consistency.

I would do "JavaScript" (which would include changing it in many other spots), but since many of the linked resources capitalize the S, I assume there's a reason that it's not done here.

Progressive Webapps > Loading Performance > Codesplitting Change "codesplitting an how" to "codesplitting and how".

Progressive Webapps > Loading Performance > Caching Change "how it can be uses" to "how it can be used".

Progressive Webapps > Rendering Performance > Stack Change "staack" to "stack".

Progressive Webapps > Security > Cross-Site Scripting Change "these kind of" to "these kinds of".

Progressive Webapps > Security > Clickjacking Change "these kind of" to "these kinds of".

Build tools > Module Bundlers Change "module bundler and how they can help" to "module bundlers and how they can help".

Testing > Acceptance Testing Add a period for consistency.

Testing > Continuous integration Change "and it" to "and how it".

Architecture & Paradigms > Paradigms > Programming Paradigms Change "paraigmes" to "paradigms".

Architecture & Paradigms > Paradigms > Higher-Order Functions Change "higher-order functions and how it" to "higher-order functions and how they".

Design & UX > Hit Targets Change "Learn about hit targets can why" to "Learn about hit targets and why".

The Modern Web > Streams Change "effeciently" to "efficiently". Change "help you efficiently transporting" to "help you in efficiently transporting" or "help you efficiently transport".

The Modern Web > Speech Synthesis Change "help you converting" to "help you in converting" or "help you convert".

The Modern Web > Observers Change "get comfortable concepts" to "get comfortable with concepts".

The Modern Web > Intersection Observer Change "Learn how to use the [] can help you" to "Learn how to use the [] and how it can help you".

The Modern Web > Share Change "help users sharing" to "help users in sharing" or "help users share".

The Modern Web > Credentials Manager API Change "how it can help authenticating" to "how it can help in authenticating" or "how it can help authenticate".

Algorithms and Data Structures > Analysis > Cost model Change "how to setup" to "how to set up".

Databases & Servers > Servers > Request-Reply Protocol Change "eachother" to "each other".