Welcome! Please note that some parts (e.g. LM555) on this page are included as an "abridged" datasheet and as a "full" datasheet.
The "abridged" datasheets should include the necessary information for gaining basic insight into a part's function.
The "full" datasheets are what the part manufacturer (e.g. Texas Instruments) currently publishes as the datasheet file for a given part and may prove useful.
You are welcome to reference either datasheet, although we recommend you use the "abridged" datasheet first :D