30 PDUs for Free

According to new structure, it is easiest to earn Free PDUs under Category 'C' (Self directed learning). You can claim 30 PDUs per cycle for reading PM articles, books, magazines, discussion etc.
Again, sure to save and store possible proofs for which you are going to claim PDUs.
Here is what the guideline from PMI says for Category 'C' -

CATEGORY C: Self-Directed Learning

Earn PDUs for self-directed learning activities which are individualized learning events involving personally conducted research or study.
Learning may include informal activities such as:
• reading articles, books, or instructional manuals;
• watching videos, using interactive CD-ROMs,Podcasts or other source material;
• having formal discussions with colleagues, coworkers, clients or consultants;
• being coached or mentored by a colleague, coworker or consultant (If you
served as a coach or mentor to someone else, report that activity under the
Volunteer Category)
Qualifying activities must be relevant to project management, project risk,
project scheduling, or program management, meet a specified purpose, and use
knowledgeable resources.

PDU Rule:

1 PDU is awarded for every 1 hour spent in a self-directed learning activity
listed in this category.
PDU restrictions for the Self-Directed Learning category are as follows:
• PMP and PgMP credential holders can earn no more than 30 PDUs in the Self-Directed Learning category per cycle
• PMI-SP and PMI-RMP credential holders can earn no more than 15 PDUs in the Self-Directed Learning category per cycle.

Documentation required upon PMI audit/request:

Evidence supporting your reported learning project, including notes from
and dates of discussion or reading.