Get all shopping cart items, subtotal, grand total, billing & shipping address

cart.md

Get all items information in cart

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$cart = $objectManager->get('\Magento\Checkout\Model\Cart'); 

// retrieve quote items collection
$itemsCollection = $cart->getQuote()->getItemsCollection();

// get array of all items what can be display directly
$itemsVisible = $cart->getQuote()->getAllVisibleItems();

// retrieve quote items array
$items = $cart->getQuote()->getAllItems();

foreach($items as $item) {
    echo 'ID: '.$item->getProductId().'<br />';
    echo 'Name: '.$item->getName().'<br />';
    echo 'Sku: '.$item->getSku().'<br />';
    echo 'Quantity: '.$item->getQty().'<br />';
    echo 'Price: '.$item->getPrice().'<br />';
    echo "<br />";            
}

Get total items and total quantity in cart

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$cart = $objectManager->get('\Magento\Checkout\Model\Cart'); 

$totalItems = $cart->getQuote()->getItemsCount();
$totalQuantity = $cart->getQuote()->getItemsQty();

Get subtotal and grand total price of cart

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$cart = $objectManager->get('\Magento\Checkout\Model\Cart'); 

$subTotal = $cart->getQuote()->getSubtotal();
$grandTotal = $cart->getQuote()->getGrandTotal();

Get billing and shipping addresses

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$cart = $objectManager->get('\Magento\Checkout\Model\Cart'); 

$billingAddress = $cart->getQuote()->getBillingAddress();
echo '<pre>'; print_r($billingAddress->getData()); echo '</pre>';

$shippingAddress = $cart->getQuote()->getShippingAddress();
echo '<pre>'; print_r($shippingAddress->getData()); echo '</pre>';