You'll probably find these previous threads of interest:

• How did the Cronus / Zeus story come about?
• Did the ancient Greeks ever worship the Titans?
• How did the Ancient Greeks view the Titans?
• Were the Titans the gods of a pre-Greek society that was supplanted?
• If the Titans were based on a previous belief system's deities, then which belief system? Pre-Indo-European? Proto-Indo-European? Proto-Hellenic? Or Pre-Dorian Mycenaean?

The executive summary would read:

• the Titans were an integral part of the generational "succession myth" that shaped Greek theogony;
• they weren't always necessarily a separate group, and some of them were considered to be still hanging around in the "now";
• there were some regional festivals for one or other of the Titans, including Kronos(!), but we don't know a huge amount about them.

More information in the linked threads! Call back here if there's anything these threads miss.