WordPress plugins directory has more than 60,000 free plugins for different functionalities. There are more in third-party marketplaces. You can install as many of them as WordPress has no limits to the allowed number of plugins. Note that too many plugins can be detrimental to your website’s health, slowing down its loading time and speed of navigation. So, install only the ones you need. You should also delete the plugins you don’t use for the same reason.