How to have two pages with same titles withing the same space in Confluence

If you try to create and save a page in Confluence which has the same title as some other page in the same space, you'll get this error:

This is because it is NOT possible to have multiple pages with the same name in a single space. Workarounds include prepending page name with (shortened) parent page name or adding invisible Unicode characters.

References:

https://community.atlassian.com/t5/Questions/Pages-with-same-name-in-space/qaq-p/443236
https://jira.atlassian.com/browse/CONFSERVER-1095
https://community.atlassian.com/t5/Confluence-questions/How-to-create-two-pages-with-the-same-name-in-different/qaq-p/875755
https://community.atlassian.com/t5/Confluence-questions/Not-able-to-create-a-page-with-the-same-title-as-another-page/qaq-p/332910
https://community.atlassian.com/t5/Confluence-questions/Create-multiple-pages-with-the-same-name-within-a-space/qaq-p/138708

How to use "Insert JIRA Issue/Filter" macro in Confluence

To add Insert JIRA Issue/Filter macro in Confluence follow the steps as in this image:

When using this macro in Confluence, it is better to use filter ID rather than JQL. JQL con contain various values which can change in time e.g. the name of the fixVersion field or project name etc...If we change JQL string in JIRA we have to change it everywhere we used it in Confluence. If we use in Confluence filter ID (which is actually JQL query ID), the only place we have to make a change is JQL in JIRA - filter ID remains the same.

Make sure that filter in JIRA is set to be shared e.g. with anyone logged-in. This will allow Confluence to execute filter in JIRA and display all JIRA tasks from it.