Best plugins for Boosting website Speed & Performance

What are the best plugins to Boost Your website speed there are a lot of plugins so you can you really or you can buy them but a lot of them are free so if your website is slow it's loading time is very slow then you can use these plugins to get rid of this minify JavaScript CSS leverage Browser caching add header expires. Compress images and all the things which are belong to the plugin or themes.
Why are websites are slow?
Website slow because of plugins sometime the same issues and some time before coding or the wordpress you are using is old. So what to do?
First I was at your website and check that everything is updated or not if everything is updated that's fine now go to your plugin area

and add new plugin you can use all of them but if you want you can use one or two of your all one by one if you want to check them all. So below are some plugins which are most used and are free:

1.wp rocket
2.Async JavaScript
3.Leverage Browser Caching
4.Merge + Minify + Refresh
5.Swift Performance
6.PageSpeed Ninja
7.p3 performance profiler

you can get All these plugins from here free WORDPRESS.ORG