When i was starting to work on my magento project from scratch, i installed successfully but when i added two or three products but it was not displaying on homepage or category page. I though what will be issue. after search i found it was issue because i require to reindex of product. I again found how to reindex, i though it re-index from admin panel, but i couldn’t find any option in admin panel.
At Last i found i can solve “one or more indexers are invalid solved” error from command line, i open my terminal and go on root directory. I run bellow command on my root directory.
php bin/magento indexer:reindex
After fire above command all the product reindex and i get products on category detail page and also solve issue from admin panel.