We use lots of popular and new plugins
1. WP Paint for Editing Images in WordPress, A very useful, light-weight, a fast image editor plugin with an intuitive interface. It can help you with basic image editing, plus more advanced features. Also, check WP Paint Pro, It has more cool features.
2. Yoast SEO: It is one of the most popular plugins for improving your SEO. It suggests Readability and SEO analysis is also very useful.
3.Akismet: it checks comments for any spams. Blocks spammy comments.
4. WordFence is the best for security.