A gerund is not a verb. It is a verb form, and it has an -ing ending (also known as a present participle). Most any action verb can be used as a gerund. An infinitive is the most basic form a verb. It is "to + verb." The infinitive does not act like a verb. Instead it acts like a noun, adjective, or adverb might in a sentence. Both gerunds and infinitives are considered verbals.
Sometimes referred to as "verb complements," gerunds and infinitives often follow verbs. When this happens, they are functioning as subjects or objects.
To learn more about gerunds and infinitives and to practice using them correctly, click on this link: Englishpage.com.
Other helpful resources on this topic:
My name is Craig, and I've been teaching English for many years. I initially created this site for my students, but all English learners are welcome. I hope you find something helpful to you. Feel free to leave suggestions or ideas in the Comments section under any entry.