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Responsive design is a web design approach that adapts to the device's layout to improve usability and navigation. It allows web pages to display the same experience across all devices, from desktops to smartphones.

Responsive design uses:
Media queries: Instructions to change the site's layout based on certain conditions, such as screen size.
Fluid grids and images: Flexible grids and layouts that adapt to different screen sizes and orientations.
Scalable Vector Graphics (SVGs): Prioritizing the use of SVGs.
Breakpoints: Including three or more breakpoints.
Relative units: Sizing design elements in relative units (%).

Some best practices for responsive design include:
Taking the mobile-first approach.
Prioritizing and hiding content.
Setting appropriate responsive breakpoints.
Taking touchscreens into consideration.
Defining typography.
Using a pre-designed theme or layout.
Testing responsiveness on real devices.

In Bootstrap, a "link tag" refers to the HTML element, which is used to create clickable links on a webpage, but with Bootstrap specific classes applied to style the appearance of the link (like color, underline, hover effects) according to the Bootstrap design system; essentially, it's a styled anchor tag within Bootstrap's framework.

In Bootstrap, the "style element" refers to a specific CSS class or combination of classes applied to an HTML element, which leverages Bootstrap's predefined styles to visually format and position content on a webpage, utilizing features like grid layout, typography, and component styling.

Containers set the width of the grid, and affect all the child elements within them. In Bootstrap, a div can be a container, a row, a column, or pretty much anything else.

container-fluid class in Bootstrap is utilized to create a full-width container that spans the entire viewport width, making it ideal for responsive layouts that extend across the entire screen.