Help hiding some options in sidebar and dashboard

Greetings! I'm learning how to use Filament and I managed to make something following a tutorial. I want to customize/hide some things but I don't really understand how to customize the dashboard (english is not my first language but I can understand some of the documentation.) I commented some lines in the filament.php file in the vendor file of the project (the Pages\Dashboard::class), and I managed to change a message in the dashboard. I understand it can be made making a new dashboard page in Filaments/Pages/Dashboard.php but I'm getting confused.
I'm sorry if my question is too basic or stupid and bothering you.
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