diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..9c388d4
Binary files /dev/null and b/.DS_Store differ
diff --git a/01/app.js b/01/app.js
index 1c9992e..a25d0a8 100644
--- a/01/app.js
+++ b/01/app.js
@@ -1 +1,4 @@
-console.log('DOM');
\ No newline at end of file
+console.log('DOM');
+
+const element = document.querySelector('.comments__item.comments__item--newest');
+console.log(element.querySelectorAll('[data-info]').length);
\ No newline at end of file
diff --git a/02/app.js b/02/app.js
index 1c9992e..67de25d 100644
--- a/02/app.js
+++ b/02/app.js
@@ -1 +1,6 @@
-console.log('DOM');
\ No newline at end of file
+console.log('DOM');
+
+const linkElements = document.querySelectorAll('[data-url]')
+linkElements.forEach(el => {
+	el.setAttribute('href', el.getAttribute('data-url'));
+});
\ No newline at end of file
diff --git a/03/app.js b/03/app.js
index c299ca3..dc9dd3b 100644
--- a/03/app.js
+++ b/03/app.js
@@ -11,4 +11,17 @@ const buttonSettings = {
         color: '#444'
     },
     text: 'Click me!',
-}
\ No newline at end of file
+}
+
+const parentForButtonElement = document.querySelector('.parent-for-button')
+const buttonElement = document.createElement('button', buttonSettings)
+
+for (attr in buttonSettings.attr) {
+    buttonElement.setAttribute(attr, buttonSettings.attr[attr])
+}
+for (style in buttonSettings.css) {
+    buttonElement.style[style] = buttonSettings.css[style];
+}
+buttonElement.textContent = buttonSettings.text
+
+parentForButtonElement.appendChild(buttonElement);
\ No newline at end of file
diff --git a/04/app.js b/04/app.js
index e6411e4..0fed2f5 100644
--- a/04/app.js
+++ b/04/app.js
@@ -2,7 +2,45 @@ console.log('DOM');
 
 // struktura do wykorzystania w pętli
 const menuItems = [
-    {text: 'start', url: '/'},
-    {text: 'galeria', url: '/gallery'},
-    {text: 'kontakt', url: '/contact'},
-];
\ No newline at end of file
+    { text: 'start', url: '/' },
+    { text: 'galeria', url: '/gallery' },
+    { text: 'kontakt', url: '/contact' },
+];
+
+const navElement = document.querySelector('nav');
+const ulElement = document.createElement('ul');
+const ulElement2 = document.createElement('ul');
+
+const link1 = document.createElement('a');
+link1.setAttribute('href', '/')
+link1.textContent = 'start';
+
+const link2 = document.createElement('a');
+link2.setAttribute('href', '/gallery');
+link2.textContent = 'galeria';
+
+const link3 = document.createElement('a');
+link3.setAttribute('href', '/contact');
+link3.textContent = 'kontakt';
+
+const li1 = document.createElement('li');
+const li2 = document.createElement('li');
+const li3 = document.createElement('li');
+
+li1.appendChild(link1)
+li2.appendChild(link2)
+li3.appendChild(link3)
+
+ulElement.appendChild(li1);
+ulElement.appendChild(li2);
+ulElement.appendChild(li3);
+
+navElement.appendChild(ulElement);
+navElement.appendChild(ulElement2);
+
+menuItems.forEach(menuItem => {
+    const li = document.createElement('li')
+    li.innerHTML = '<a href="' + menuItem.url + '">' + menuItem.text + '</a>'
+    ulElement2.append(li);
+})
+
diff --git a/05/app.js b/05/app.js
index 39abe5d..5e32656 100644
--- a/05/app.js
+++ b/05/app.js
@@ -1,3 +1,24 @@
 console.log('DOM');
 
 const curr = document.querySelector('.js-curr');
+
+const deleteButton = document.createElement('button')
+deleteButton.textContent = 'usuń z koszyka'
+curr.insertAdjacentElement('afterend', deleteButton)
+
+curr.parentNode.childNodes.forEach(element => {
+	element.classList && ![...element.classList].includes('js-curr') && element.classList.add("siblings");
+});
+
+curr.parentElement.nextElementSibling.setAttribute('title', 'nextElementSibling');
+
+const newPElement = document.createElement('p')
+newPElement.textContent = 'To jest nowy paragraf.'
+
+curr.parentElement.parentElement.lastElementChild.querySelector('.article__btn').insertAdjacentElement('beforebegin', newPElement);
+
+const newArticleElement = curr.parentElement.nextElementSibling.cloneNode(true);
+newArticleElement.querySelector('.article__title').textContent = 'To jest nowy artykuł!'
+newArticleElement.querySelector('.article__description').textContent = 'To jest treść nowego artykułu!'
+
+curr.parentElement.parentElement.prepend(newArticleElement);