Hi, welcome to the OB.
1. The roots look healthy.
2. If you plan on repotting now, it's fine. Spring through summer is usually the prime growing season for Phals.
3. When repotting, if the roots cannot fit into the current pot, you may need to get a pot that is about 1/2" larger.
4. The flowers are almost done blooming.
5. Bud blast is when the buds prematurely drop.
There is a sticky called "The Phal abuse ends here." in the Beginner Discussion forum. Most of your questions will be answered there.
The OB also has a glossary of terms. If there are any further questions regarding terms and their definitions, don't hesitate to ask for better clarification.
As you can see, photos can drastically improve the quality of the answers you receive to your questions.
Should there be any more specific questions you may feel free to ask.