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Certificate types X.509 certificates: X.509 certificates are the most common type of digital certificate. They are often used for website security and for email encryption. X.509 certificates can be issued by either a trusted third party or by a company or organization include many types :-

1. PEM (Privacy Enhanced Mail ): the most common type of X.509 certificate format and is most likely used in Unix/Linux-based operating systems. It is a Base64-encoded DER certificate. This is the format most of the Certificate Authorities (CA) issue certificates with .pem, .crt, .cer, or .key extensions. PEM certificates can be used with Apache, Microsoft IIS , and other web servers. It is possible to bundle the server certificate, the intermediate certificate, and the private key within a single PEM certificate. Or you can have all of them in a separate file.
2. DER (Distinguished Encoding Rule) : is a binary form of a PEM certificate. Often *used in Windows and with Jav

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Information gathering

Lookup windows error codes

Use CertUtil to Find Descriptions of Windows Error Codes. To start using CertUtil, launch a Command Prompt window on your PC. You can do this by opening the "Start" menu, searching for "Command Prompt", and selecting the tool. type the following command and press Enter. Enter the command below.

Example:

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What is the Curl command ?

• Networking command available on windows, Linux and macOS.
• Curl stands for (Client URL)

[!hint] cURL on windows Windows 10/11 come with curl built in them, you can use the curl command from PowerShell or cmd

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<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="40dp"
    android:height="40dp"
    android:viewportHeight="40.0"
    android:viewportWidth="40.0">

    <path
        android:name="curves"
        android:pathData="M 30 5

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# no logging in production
-assumenosideeffects class android.util.Log {
  v(...);
  d(...);
  i(...);
  w(...);
  e(...);
  println(...);
}

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import java.math.BigDecimal;
import java.util.Locale;
import java.text.*;
public class CurrencyAmoutBdecimalConverter{

     public static void main(String []args)throws ParseException{
         final String dollarsA = "$199.00";
        final String real = "R$ 399,00";
        final String dollarsB = "£25.00";
        final String tailingEuro = "90,83 €";

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import java.text.NumberFormat;
import java.util.Currency;
import java.util.Locale;
import java.util.Scanner;

public class CurrencyFormatter {
    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double payment = scanner.nextDouble();

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import java.util.*;
import java.util.stream.Collectors;

public class Anagrams {
 private static String[] anagrams = {
            "pear",
            "amleth",
            "dormitory",
            "tinsel",
            "dirty room",

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fun View.snack(message: String, length: Int = Snackbar.LENGTH_LONG, f: Snackbar.() -> Unit) {
    val snack = Snackbar.make(this, message, length)
    snack.f()
    snack.show()
}

fun Snackbar.action(action: String, color: Int? = null, listener: (View) -> Unit) {
    setAction(action, listener)
    color?.let { setActionTextColor(color) }
}

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fun <T> Bundle.put(key: String, value: T) {
    when (value) {
        is Boolean -> putBoolean(key, value)
        is String -> putString(key, value)
        is Int -> putInt(key, value)
        is Short -> putShort(key, value)
        is Long -> putLong(key, value)
        is Byte -> putByte(key, value)
        is ByteArray -> putByteArray(key, value)
        is Char -> putChar(key, value)