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Cheat Sheets
This is a collection of handpicked cheat sheets that have been approved for use on this site only! The rights holder is linked below in each case.
Never memorize something that you can look up. Albert Einstein
Languages
Computer based formal languages.
CSS 
Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language such as HTML or XML (including XML dialects such as SVG, MathML or XHTML).
Box Shadow
Color Psychology
Color psychology is the study of hues as a determinant of human behavior. Color influences perceptions that are not obvious, such as the taste of food. Colors have qualities that can cause certain emotions in people. How color influences individuals may differ depending on age, gender, and culture. Although color associations can vary contextually between cultures, color preference is thought to be relatively uniform across gender and race.
Cursor
Filter
Grid
![grid-[row|column]-gap](/images/cheat-sheet/css-grid-2.webp)
Tailwind CSS
Tailwind CSS is a utility-first CSS framework packed with classes like flex, pt-4, text-center and rotate-90 that can be composed to build any design, directly in your markup.
Interactive cheat sheets to quickly find class names and CSS properties: Tailwind CSS Cheat Sheet — tailwindcomponents.comTailwind CSS Cheat Sheet — Flowbite
D2
D2 is a modern language that turns text to diagrams. Create beautiful diagrams in minutes. Simple syntax. Endlessly customizable.
JS
JavaScript (JS), is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS.
Array
In computer science, array is a data type that represents a collection of elements (values or variables), each selected by one or more indices (identifying keys) that can be computed at run time during program execution
Asynchronous
The
async/awaitpattern is a syntactic feature of many programming languages that allows an asynchronous, non-blocking function to be structured in a way similar to an ordinary synchronous function.
Mastering Async JavaScript
Build an unassailable understanding of JavaScript's callbacks, promises and async/await syntax over the course of 47 live examples and exercises.
DOM Events
DOM (Document Object Model) Events are a signal that something has occurred, or is occurring, and can be triggered by user interactions or by the browser. Client-side scripting languages can register various event handlers.
SQL
Structured Query Language (SQL) is a domain-specific language used in programming and designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).
SQL Joins
A join clause in the Structured Query Language (SQL) combines columns from one or more tables into a new table. The operation corresponds to a join operation in relational algebra. Informally, a join stitches two tables and puts on the same row records with matching fields :
INNER,LEFT OUTER,RIGHT OUTER,FULL OUTERandCROSS.
Methodologies
Twelve-Factor App
The Twelve-Factor App methodology is a methodology for building software-as-a-service applications. These best practices are designed to enable applications to be built with portability and resilience when deployed to the web.
SAP
SAP SE is a German multinational software company based in Walldorf, Baden-Württemberg. It develops enterprise software to manage business operations and customer relations. The company is the world's leading enterprise resource planning (ERP) software vendor.
ABAP CDS
The ABAP Core Data Services (ABAP CDS) are the implementation of the general CDS concept for AS ABAP. ABAP CDS makes it possible to define semantic data models on the central database of the application server.
Modern ABAP
ABAP (Advanced Business Application Programming, originally Allgemeiner Berichts-Aufbereitungs-Prozessor, German for "general report preparation processor") is a high-level programming language.
RAP Basics
The ABAP RESTful Application Programming Model (RAP), together with Fiori Elements, allows developers to efficiently build cloud-ready, transactional business apps, services, and extensions on SAP BTP ABAP Environment.
Browser version English
SAP HANA SQLScript
SAP HANA (HochleistungsANalyseAnwendung or High-performance ANalytic Application) is an in-memory, column-oriented, relational database management system developed and marketed by SAP SE. The motivation behind SQLScript is to embed data-intensive application logic into the database.
Standards
HTTP Status Codes
Status codes are issued by a server in response to a client's request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the HTTP.
JSON
JavaScript Object Notation (JSON) is an open standard file format and data interchange format that uses human-readable text to store and transmit data objects consisting of attribute–value pairs and arrays (or other serializable values). It is a common data format with diverse uses in electronic data interchange, including that of web applications with servers.
JSON Web Tokens (JWT)
JSON Web Tokens are an open, industry standard RFC 7519 method for representing claims securely between two parties.
JWT.IO allows you to decode, verify and generate JWT.
Regular Expression (Regex)
A regular expression (shortened as regex or regexp; sometimes referred to as rational expression) is a sequence of characters that specifies a match pattern in text.
URL
A Uniform Resource Locator (URL), colloquially termed a web address, is a reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it. A URL is a specific type of Uniform Resource Identifier (URI).
Tools
Git
Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
