- It offers an opportunity to get information, to learn the activities, and to look for a job.
- It offers an opportunity to get information, learn the activities, and look for a job.
- It offers an opportunity to get information learn the activities and look for a job
1 and 2 are correct.
First of all, 3 can be ruled out since the use of and in a list of more than two items needs commas.
Structural use of and:
.... x, y(,) and z.
x, y, and z should be of the same structure/ part of speech, i.e., all nouns, verbs, or even clauses.
I like to eat apples, mangoes, and oranges.
I like travelling around, solving puzzles, and playing basketball.
My every day routine is to eat, work, and sleep.
My everyday routine is to eat, to work, and to sleep.
This student is clever, humourous, and humble.
1 is OK as described in the to-infinitives case, while 2 is similar to the bare infinitives case.
Hope this helps!
1. We usually use the preposition 'about' or 'through' after learn
2. The second comma in the examples above can be omitted. Some people, like me, use it for clarity. It is called the Oxford comma.