When you make a list in any kind of writing, whether it is a resume, an essay, or an article to be published, there are a few specific rules to follow.
Begin a list with a statement introducing the list. The statement ends with a colon. Here are some examples.
I have extensive editing skills:
-Three years volunteering with student newspaper;
-Two years in a professional consulting firm;
-Twenty years freelance editing.
Editing tasks that I undertake when reviewing a paper include:
-Proofreading all copy for misspelled words;
-Reviewing all sentences for run-ons or sentence fragments;
-Checking logic for consistency and flow;
-Checking paragraph transitions for logic and flow.
Each item in the list must be in the same grammatical form. In the first example above the list items were all things. There were no list items in verb form with -ing. In the second list all items were in the verb form, and did include the -ing form. It is also important that all verbs be in the same form, so if you use the -ing form, they should all be -ing form. If not the -ing form, then all should be present tense or past tense. Just make sure they are the same.