The main [Tutorial - User Guide](../tutorial/index.md) should be enough to give you a tour through all the main features of **FastAPI**.

In the next sections you will see other options, configurations, and additional features.

/// tip

The next sections are **not necessarily "advanced"**.

And it's possible that for your use case, the solution is in one of them.

///

  val withoutSectionSpans = withoutSectionSpans(simplified)
  val sections = sections(withoutSectionSpans)

  val rangesBuffer = Buffer()
  val mappingsBuffer = StringBuilder()
  val sectionIndexBuffer = Buffer()

  var previousMappedRanges: List<MappedRange>? = null

  for ((section, sectionMappedRanges) in sections) {
    // Skip sequential ranges when they are equal.

/// tip

The next sections are **not necessarily "advanced"**.

And it's possible that for your use case, the solution is in one of them.

///

## Read the Tutorial first { #read-the-tutorial-first }

The next sections assume you already read the main [Tutorial - User Guide: Security](../../tutorial/security/index.md).

    sink: BufferedSink,
  ): Boolean {
    val sectionsIndex = findSectionsIndex(codePoint)

    val rangesPosition = sections.read14BitInt(sectionsIndex + 2)

    val rangesLimit =
      when {
        sectionsIndex + 4 < sections.length -> sections.read14BitInt(sectionsIndex + 6)
        else -> ranges.length / 4
      }

    val rangesIndex = findRangesOffset(codePoint, rangesPosition, rangesLimit)

import subprocess
import time

import httpx
from playwright.sync_api import Playwright, sync_playwright


# Run playwright codegen to generate the code below, copy paste the sections in run()
def run(playwright: Playwright) -> None:
    browser = playwright.chromium.launch(headless=False)
    # Update the viewport manually
    context = browser.new_context(viewport={"width": 960, "height": 1080})
    page = context.new_page()

concepts you should probably keep in mind when deploying a **FastAPI** application (although most of it applies to any other type of web application).

You will see more details to keep in mind and some of the techniques to do it in the next sections. ✨...

# Learn { #learn }

Here are the introductory sections and the tutorials to learn **FastAPI**.

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;

/**
 * Verifies that plugin execution sections in the parent POM that have
 * inherit == false are not inherited to the child POM.
 */
@Deprecated
class ProjectInheritanceTest extends AbstractProjectInheritanceTestCase {

But you can still document it as described in [Additional Responses in OpenAPI](additional-responses.md).

                })
                .count();
        fixed |= fixedCombineSelfCount > 0;

        return fixed;
    }

    /**
     * Fixes duplicate dependencies in dependencies and dependencyManagement sections.
     */
    private boolean fixDuplicateDependencies(Document pomDocument, UpgradeContext context) {
        Element root = pomDocument.root();

        // Collect all dependency containers to process