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First, the business logic should be extracted into the service class. 1. Create the service class to process complex logic. The controller is only responsible for HTTP requests and responses; 2. Use FormRequests for verification and authorization, and move rules and permission checks out of the controller; 3. Split large controllers according to responsibilities, such as splitting the UserController into UserAccountController, UserPreferencesController and UserSecurityController; 4. Optionally use the warehouse pattern to abstract data access logic to improve testability and decoupling; 5. Use APIResources or ViewComposes to respond uniformly

Laravel service container is a tool for managing class dependencies and performing dependency injection. It simplifies object creation by automatically parsing dependencies in constructors and method parameters, or manually obtaining instances through app() function; it supports advanced usage such as binding interfaces and implementations, delayed loading, singleton binding and closure binding. 1. Automatically resolve dependencies in constructors and method parameters; 2. Manually obtain instances using app() function; 3. Bind interfaces to specific implementations; 4. Support delayed binding, singleton binding and closure binding.

BEM is a CSS naming specification that improves code readability, reduces conflicts and facilitates maintenance. 1.Block is a separate component, such as .btn; 2.Element is an integral part of Block, such as .nav\_\_link; 3.Modifier represents a state or variant, such as .btn--large. The naming formats are .block, .block\_\_element, .block--modifier or .block\_\_element--modifier respectively. Using BEM can avoid class name conflicts, improve maintainability, and facilitate team collaboration. Notes include: avoiding too deep levels, using Modifier reasonably,

Huobi is a world-renowned digital asset service platform, providing users with a safe and reliable trading experience. Huobi App integrates various functions such as market viewing, trading, asset management, etc., making it convenient for users to operate anytime, anywhere.

Binance is a world-renowned digital asset trading platform, providing users with a wide range of cryptocurrency trading services, secure asset management and rich financial products. Its app has a simple design and smooth operation, and is the first choice trading tool for many digital currency enthusiasts.