I agree with the first answer provided, but would replace "ordinary" by "regular". I think the stress on "普通" is on this course being "conventional" rather than "not being special"...

From the Oxford Dictionary of American English:

"REGULAR
adjective
1 arranged in or constituting a constant or definite pattern, esp. with the same space between individual instances : place the flags at regular intervals | a regular arrangement.
• happening in such a pattern with the same time between individual instances; recurring at short uniform intervals : a regular monthly check | her breathing became deeper, more regular.
• (of a person) doing the same thing or going to the same place with the same time between individual instances : regular worshipers.
• (of a structure or arrangement) arranged in or constituting a symmetrical or harmonious pattern : beautifully regular, heart-shaped leaves.
• (of a person) defecating or menstruating at predictable times.
2 done or happening frequently : regular border clashes | parties were a fairly regular occurrence.
• (of a person) doing the same thing or going to the same place frequently : a regular visitor.
3 conforming to or governed by an accepted standard of procedure or convention : policies carried on by his deputies through regular channels.
(...)"

whereas,

"ORDINARY
adjective
1 with no special or distinctive features; normal : he sets out to depict ordinary people | it was just an ordinary evening. See note at normal .
• uninteresting; commonplace : ordinary items of everyday wear.
2 (esp. of a judge or bishop) exercising authority by virtue of office and not by delegation.
(...)"