Pārāśara dedicates ten consecutive chapters (30–39) to yogas — combinations that produce specific results. The yoga-system is the interpretive 'second pass' after bhāva and graha-bala analysis: you identify which yogas are present in a chart, weight them by graha-bala and bhāva-placement, and use the synthesis as one input among many. Yogas are not predictions; they are pattern-identifications.
The most important categories: Rāja-yogas (Ch. 33) form from unions of kendra-lords and trikoṇa-lords. The 1st, 5th, 9th lords are trikoṇa; the 4th, 7th, 10th are kendra. Combinations of these (conjunction, mutual aspect, exchange) produce rāja-yogas of varying potency. Dhana-yogas (Ch. 35) form from links between dhana-houses (2nd, 5th, 9th, 11th — the artha-trikoṇa). Viśeṣa-yogas (Ch. 37) include the famous Gaja-Kesari (Jupiter in kendra from Moon).
Ch. 38 (Nīca-bhaṅga-rāja-yoga) is one of the most-studied chapters in classical jyotiṣa. A nīca (debilitated) graha is weak — but if any of the five bhaṅga conditions apply (the lord-of-the-nīca-rāśi is in kendra from lagna or Moon; the lord-of-the-exaltation-rāśi-for-that-graha is in kendra; the graha is conjunct or aspected by its dispositor; etc.), the debilitation is cancelled and the graha returns to high-strength — sometimes producing remarkable rāja-yoga results from what looked like an affliction.