Flexbox is a must-have skill for front-end developers 

Its grid system is one of its biggest features, but the adoption of CSS Grid by mainline browsers means that Bootstrap 4's new flexbox-based grid is already outdated. 

Why CSS Grid is better than Bootstrap for creating layouts 

The Bootstrap team has a comprehensive guide for migrating to Bootstrap v4. However, there is a very nifty tool from the community, that allows you to drop in a piece of code and convert it to the Bootstrap v4 equivalent. 

RTL edition of bootstrap v4 for rtl languages like Farsi and Arabic http://getbootstrap.com 

Bootstrap RTL Standard (Right To Left Support) 

ngx-bootstrap v2
Dozens of fixes and new samples, hundreds of tests, tens of thousands lines of code and new documentation styling!
With support for @getbootstrap v4 

It’s literally taken us years to do it, but Bootstrap 4 has finally arrived!  

DoFilter is a Full Responsive Bootstrap Multipurpose Filtering and Shorting plugin built on Latest Version of Bootstrap Framework (v3.3.7), HTML5, CSS3 and jQuery. Its wonderful features can be used to Filtering and Shorting your website content as like Portfolio, Service, Team, Blog, Products, Pricing, FAQ etc. Also you can customize it for Filtering and Shorting any your website content.

DoFilter is a Full Responsive Isotope Multipurpose Filtering and Shorting plugin. Filtering can hide and show item elements with the filter option. Items that match that filter will be shown. DoFilter Responsive Isotope Multipurpose Filtering and Shorting can rearrange the order of item elements based on their data. Items that do not match will be hidden.

There are 19+ filter styles with 100% responsive design. Indeed, you will be able to showcase your content on mobile devices such as smart phones and tablets. It has many features like CSS3 and jQuery animations, single and multiple Shorting and Filtering. All the codes are clean and well organized. Also have proper help documentation. It looks great with all types of devices.