Add changes to Loops lesson

Author: kochaika

Loops/Break keyword/task.md

@@ -5,6 +5,7 @@ always be `True`, such a loop becomes infinite. The most straightforward way to
 an infinite loop is to use `while True`. The `break` keyword is used to 
 escape the loop.  
 
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6302#break).
 
 Write a condition to exit the loop on its third iteration after evaluating if `animal`
 is equal to `elephant`.  Use the `break` statement.  The `zoo` list in the end should contain 

Loops/Continue keyword/task.md

@@ -5,6 +5,8 @@ the current iteration only and proceed right to the next one. The loop returns t
 `while` statement and evaluates the condition again. If there is no next item, 
 the `else` clause is executed if it is present.
 
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6302#continue).
+
 Print only the odd numbers `1, 3, 5, 7, 9`.  
 
 <div class='hint'>Use the <code>%</code> operator to check if <code>x</code> is even.</div>

Loops/Else with loops 2/task.md

@@ -18,8 +18,7 @@ The `else` statement will only be executed if `n` is a prime number, i.e. the `i
 `for` loop. 
 
 ### Task
-
-Inside the [function](course://Functions/Definition) `contains_even_number()`, write a `for` loop that would iterate over a list `lst` and, if an even element is found,
+Inside the [function](course://Loops/Else with loops 2) `contains_even_number()`, write a `for` loop that would iterate over a list `lst` and, if an even element is found,
 print `f"List {lst} contains an even number."` and exit the loop, if no such element is found, print `f"List {lst} does not contain an even number."`. 
 
 <div class="hint">

Loops/Else with loops/task.md

@@ -34,6 +34,8 @@ Remember, an `else` after an `if` statement is skipped and NOT executed if the e
 `if` is `True`, while in the case of loops, an `else` clause is executed after the loop itself
 is completed (unless there was a `break` in there somewhere).
 
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6302).
+
 In the code editor, add two lines of code to the second loop to make sure the loop only prints
 numbers 1 and 2 and never prints the phrase `"for loop is done"`.
 

Loops/For loop/task.md

@@ -8,6 +8,8 @@ for each item. When the items are exhausted, the loop terminates.
 
 You can read more about the `for` statement on <a href="https://docs.python.org/3/reference/compound_stmts.html#the-for-statement">this page</a> of Python Documentation.
 
+For more structured and detailed information, you can also refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6065).
+
 Print each prime number from the `primes` list using the `for` loop. A prime 
 number is a natural number greater than `1` that has no positive divisors 
 other than `1` and itself.  

Loops/List Comprehension/task.md

@@ -28,6 +28,8 @@ Output:
 ```
 List comprehensions are also more efficient computationally than a `for` loop.
 
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6315).
+
 In the code editor, use list comprehension to build `my_efficient_list` from the elements of `my_inefficient_list`
 by adding $10$ to each of them. For example, the first element of `my_inefficient_list` is $1 + 10 = 11$,
 so the first element of `my_efficient_list` should be $11 + 10 = 21$, and so on.

Loops/Nested List Comprehension/task.md

@@ -33,6 +33,8 @@ Output:
 [[0, 2, 4, 6, 8], [0, 2, 4, 6, 8], [0, 2, 4, 6, 8]]
 ```
 
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6938#nested-list-comprehension).
+
 ### Task
 
 Create a $10×10$ `matrix` such that each row (sublist) contains **characters** 0–9 from

Loops/Nested for Loop/task.md

@@ -29,6 +29,7 @@ Note that any type of loop can be nested inside another loop.
 For example, a [`while` loop](course://Loops/While loop) (see further) can be nested inside a `for` loop, or vice versa.
 </details>
 
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/6065#nested-loop).
 
 You are given a tic-tac-toe board of 3x3, your task is to print every position. Coordinates along each side
 are stored in the list `coordinates`. The output should be:

Loops/While loop/task.md

@@ -3,6 +3,8 @@
 A `while` loop is somewhat similar to an `if` statement: it executes some code if some 
 condition is `True`. The key difference is that it will continue to execute indented 
 code for as long as the condition is `True`.  If the expression is `False`, the loop terminates.
+
+For more structured and detailed information, you can refer to [this Hyperskill knowledge base page](https://hyperskill.org/learn/step/5940).
 
 Print all squares from `1` to `9`  `(1, 4, ... , 81)`. Use the `number` variable in a
 `while` loop.