if grid can do everything that flexbox does, can I use only css grid?

You can use CSS Grid for almost everything that Flexbox can do, especially for complex and two-dimensional layouts. CSS Grid provides extensive control over layout arrangement in both rows and columns, making it highly versatile for a wide range of designs. However, while you can use only CSS Grid in many cases, there are situations where Flexbox might be more suitable or easier to use.

When to Prefer CSS Grid

• Two-Dimensional Layouts: For layouts that require precise control over both rows and columns simultaneously. Grid is inherently designed for two-dimensional layouts, making it ideal for complex web designs.
• Complex Alignment and Positioning: When you need to align content in ways that involve overlapping or precise placement across two dimensions.
• Template Areas: CSS Grid allows you to define template areas in your layout, which is useful for creating layouts that map closely to your design mockups.

When Flexbox Might Be Better

• One-Dimensional Layouts: Flexbox is designed for one-dimensional layouts, either in a row or a column. It's simpler and more straightforward for these types of layouts. For example, aligning items in a single row or column, such as a navigation bar or a set of form elements, is where Flexbox shines.
• Content That Dynamically Scales: Flexbox is great for scenarios where you want the size of items to adjust based on the content, container size, or both. It's very good at handling dynamic or unknown sizes.
• Simplicity in Smaller-scale Layouts: For smaller components and simpler layouts, Flexbox's simplicity and less verbose syntax can be more efficient to write and understand.

Combined Use

In practice, using CSS Grid and Flexbox together often provides the best solution. CSS Grid can manage the overall layout structure, while Flexbox can handle the alignment and distribution of items within grid cells. This approach leverages the strengths of both layout models.

Considerations

• Browser Support: Both CSS Grid and Flexbox are widely supported in modern browsers. However, if you're working on projects where browser compatibility is a concern, especially with older browsers, you'll need to check support for specific features.
• Learning Curve: CSS Grid is powerful but comes with a steeper learning curve due to its complexity and range of properties. Flexbox is generally simpler to learn and use for basic layouts.