I am not able to connect to Salesforce from AEP. I have the correct Client ID and Secret Key. Added the network access as shown. When I click on Connect I get Invalid Request in the browser console  

I am still having problems connecting aep data source to salesforce crm I have entered the correct client id, secret key and environment url correctly and the api version 52.0i am still not able to connectusing the same salesforce credentials i am able to connect AEM forms to salesforce, but with AE...

The link provided by pranay will only work for AEM Forms 6.5 and will not work for AEM Forms CS

Not possible without using xdp

correct, you need to follow the link I sent earlier The form objects in the designer will not work with  your use case

https://experienceleague.adobe.com/en/docs/experience-manager-65/content/forms/developer-reference/form-bridge-apis

https://experienceleague.adobe.com/en/docs/experience-manager-65/content/forms/developer-reference/form-bridge-apis

You will have to setup reverse proxy with the web server similar to embedding Adaltive Form in extern web page 

Approach 1 is betterfor custom fonts refers to. Question 7 in this FAQs https://experienceleague.adobe.com/en/docs/experience-manager-65/content/forms/html5-forms/faq

Drag and drop a new component and try again