I need a plugin that takes information from a form and inserts it into the database, I also want to be able to change, query and delete this data in an admin page.
They can be distinct plugins for each function.
I understand PHP fairly, but I'm not familiar with WP, which complicates, as I find it very limited, but I need to use it.
Generic CRUDs plugin within WordPress is not very necessary when one has good use of the global class $ wpdb .
Create your own plugins by manipulating the% with%. However, there are plugins for generic purposes, but may not answer to specific situations.
As @Lollipop mentioned, using wpdb can solve your problem. But in the case of plugins, I believe Contact Form DB can give you some light. I've used it along with Contact Form 7 on multiple projects, and it works great. Its interface allows you to query and delete form inputs directly from the WP administration panel. As for change, things get complicated. I know there is a paid plugin for this, but I have never used it (and did not need it).
