I am new to LibreNMS

first and foremost here is my Validation output

Component Version
LibreNMS 1.60-81-gcf023b936
DB Schema 2020_02_10_223323_create_alert_location_map_table (159)
PHP 7.4.3
MySQL 10.3.22-MariaDB-0+deb10u1
RRDTool 1.7.1

[OK] Composer Version: 1.9.3
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct

apart form this i have a few question

  1. how can i specific what to monitor via snmp instead of monitoring everything
  2. i witch my graphic form png to svg which was not default option i can see the linux.svg for the device but my preview graphs and actual graphs missing
  3. how can i edit my icons to the device
    as you can see by my picture grap are missing i see that RRD file is there and the main graph i see but the preview grap is missing and icons

any help thanks