A comma cannot sound as it's used only in writing. Please familiarise yourself with Polish punctuation rules because in this sentence comma is mandatory. The link to this blog can be helpful: http://www.jezykowedylematy.pl/2011/10/przecinki-i-imieslow-zakonczony-na-ac/
Participle and Gerund. Geez, Duolingo really has very small limits on the short names of skills...
There's something about participles here: https://blogs.transparent.com/polish/advanced-grammar-participles-imieslowy/ - but I didn't have time to check myself if it's good.
And gerunds... well, gerunds are just nouns created from verbs, so that's rather easy. One important thing is that a gerund takes a direct object in Genitive, for example "oglądanie telewizji" (so like "watching of TV").
Oh so adjectival and adverbial participles. I see. Also are gerunds the same as verbal nouns, like "jedzenie," "podróżowanie," etc.? Thank you for the responses and all your insight and help with the language and its grammar. I recently just completed this skill and have earned the Golden Owl for Polish and couldn't have done it without you.
You're very welcome, and may I say that I always enjoy answering people like you, who clearly put effort to understand this language and succeed :) Congratulations!
Wikipedia says that "verbal noun" is a bit wider than "gerund", as it not only includes gerunds, but possibly also infinitives.