Now a days, Drupal framework became an important part of web development.
So, when you are going to develop a website by using Drupal and in that if you want to create new block;
Then following are the things to keep in mind and simple steps to create new block.
1) Go to structure -> block -> Add Block.
2) Click on Add block.
3) Create new block window will get opened. In that, fill all required details.
4) And while selecting text format then the format should be FULL HTML ONLY. If not then, when if we wanted to change/modify that block then whatever changes we have been applied previously that changes will get vanished.
And we have to keep applying those changes again and again irrespective of opening the block.
So, it’s better to select/keep text format as FULL HTML ONLY. This will help you to save your time while modifying the block.