refactor the task list

Author: SarahAlidoost

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,21 +5,20 @@ Please keep in mind that lesson maintainers are volunteers and it may be some ti
 
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-## Tasks
+## Before you start
 
 - [ ] Read [CONTRIBUTING.md](https://github.com/ESMValGroup/tutorial/blob/master/CONTRIBUTING.md).
-- [ ] Create an [issue](https://github.com/ESMValGroup/tutorial/issues) to discuss what you are going to do.
+- [ ] Create an [issue](https://github.com/ESMValGroup/tutorial/issues) to discuss your idea. This allows your contributions to be incorporated into the tutorial.
+
+## Tasks
+
 - [ ] Give this pull request a descriptive title.
-- [ ] If you are contributing to the lesson materials, please make sure the content conforms to the `Lesson development` section in [CONTRIBUTING.md](https://github.com/ESMValGroup/tutorial/blob/master/CONTRIBUTING.md) and does not contain any spelling or grammatical errors.
-- [ ] Preferably Codacy code quality checks pass. However, a few remaining hard to solve Codacy issues are still acceptable. Status can be seen below your pull request. If there is an error, click the link to find out why. If you suspect Codacy may be wrong, please ask by commenting.
+- [ ] If you are contributing to existing lesson materials, please make sure the content conforms to the `Lesson development` section in [CONTRIBUTING.md](https://github.com/ESMValGroup/tutorial/blob/master/CONTRIBUTING.md) and does not contain any spelling or grammatical errors.
+- [ ] If you are making a new episode, please make sure the content conforms to the `Lesson organization` and `Lesson formatting` sections in [CONTRIBUTING.md](https://github.com/ESMValGroup/tutorial/blob/master/CONTRIBUTING.md) and does not contain any spelling or grammatical errors.
+- [ ] Preferably Codacy checks pass. Status can be seen below your pull request. If there is an error, click the link to find out why.
 - [ ] Preview changes on your machine before pushing them to GitHub by running `make serve`, alternatively `make docker-serve`. Please see the `Previewing your changes locally` section in [CONTRIBUTING.md](https://github.com/ESMValGroup/tutorial/blob/master/CONTRIBUTING.md) for installation instructions.
 - [ ] All code instructions have been tested.
 
-## More tasks for a new episode
-
-- [ ] Follow `Lesson organization` in [CONTRIBUTING.md](https://github.com/ESMValGroup/tutorial/blob/master/CONTRIBUTING.md).
-- [ ] Follow `Lesson formatting` in [CONTRIBUTING.md](https://github.com/ESMValGroup/tutorial/blob/master/CONTRIBUTING.md).
-
 If you need help with any of the tasks above, please do not hesitate to ask by commenting in the issue or pull request.
 
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