From time to time I link to an article by Francis Frangipane, a teacher whose wisdom and insight I respect. Pastor Frangipane consistently lists four concepts that form the substance of his life, teaching, and ministry: Christlikeness, humility, prayer, and Christian unity. These are constantly exhibited in his writing.
One of Pastor Frangipane's ministry endeavors is a distance-learning program in those four fundamentals called In Christ's Image Training. There are several levels of certification and accountability including a free written materials-only version.
I want to make clear that I haven't taken this course myself and can't comment on it from personal experience. But I have yet to be disappointed or uneasy about anything I have read by Pastor Frangipane. I'm mentioning this here in case that there is some reader who is hungering for Christlikeness, humility, prayer, and unity that the Holy Spirit stimulates to take this course.