Power Fx formula reference for Power Apps
https://docs.microsoft.com/en-us/power-platform/power-fx/formula-reference
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What is Microsoft Power Fx?
https://powerapps.microsoft.com/en-us/blog/what-is-microsoft-power-fx/
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Változók , Variables :
https://docs.microsoft.com/hu-hu/power-platform/power-fx/variables

if else:

https://docs.microsoft.com/en-us/power-platform/power-fx/reference/function-if

PowerApps OnStart and OnVisible Development Tricks

Controls – How to add a clickable image / image button
http://powerappsguide.com/blog/post/add-clickable-image-button

A Power apps kijelző használata:
https://support.microsoft.com/hu-hu/office/a-power-apps-kijelz%C5%91-haszn%C3%A1lata-6285f05e-e441-408a-99d7-aa688195cd1c

Unable to submit form due to ‘Title’ field required, but is not there

https://powerusers.microsoft.com/t5/Building-Power-Apps/Unable-to-submit-form-due-to-Title-field-required-but-is-not/td-p/282625

List Settings> Click on Title > Require that this column contains information > (no) > ok

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Retrieve Sharepoint list ID on Confirmation page after form submit
https://powerusers.microsoft.com/t5/Building-Power-Apps/Retrieve-Sharepoint-list-ID-on-Confirmation-page-after-form/td-p/62928

Solution: EditForm1.LastSubmit.ID

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Open External Links in Power Apps with Power Fx Launch Function

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CSS:
Edit CSS for themes

https://docs.microsoft.com/en-us/power-apps/maker/portals/edit-css