Now you can create a developer instance for learning and creating power apps. It will not expire unlike a trail instance.
Use the below link to know more about this.
https://docs.microsoft.com/en-us/powerapps/maker/dev-community-plan
Use the below link to create your developer instance.
https://powerapps.microsoft.com/en-us/communityplan/
Phani Rajasekhar 
Nice sharing. Please can you also add following possibility to your blog.
I am glad you liked my post. Follow option is available for my blog in the right hand side under “Blog Stats”.
I means an Email subscription or RSS following. WordPress doesn’t send me Email that you publish a new article.