How to fetch entries in custom plugin Craft 3? I am creating custom search based on entries. I need to fetch entries in custom plugin.
For instance like this:

$entries = Entry::find()
    -&gt;section('sectionName')
    -&gt;orderBy('fieldName')
    -&gt;limit(null)
    -&gt;all();


Have a look here in the documentation (for the code examples you can toggle Twig and PHP view for code examples):
https://docs.craftcms.com/v3/dev/element-queries/entry-queries.html

Note that if you add use craft\elements\Entry; to the top of your plugin file, you can use the Entry::find() directly, you don't need the namespace prefix like in the examples in the documentation (for instance \craft\elements\Entry::find();).