It is very important to understand the Yogas in a horoscope. Yoga is a combination of Grahs indicating favorable or unfavorable results, Placement of the favorable and compatible planets bring about good yogas, however the same strength of yoga could be malefic if it is not a mix. I have studied astrology with through different sources, I am presenting to you the best so far. The mailer astrology India clear explains the Yogas and Yoga-Karakas in horoscope.
Also match the names of rashi with the perivious blog with English western sign, this wil be good practice.
“ Yoga Karakas
1. O Brahmin, Now listen to the effects arising out of lordships of grahas over bhavas.
2-7. Nature due to Lordships of Grahas: Benefics owning Kendras will not give benefic effects, while malefics owning Kendras will not remain inauspicious. The lord of a Kon will give auspicious results. The lord of Lagn is specially auspicious as Lagn is a Kendr as well as a Kon. Putr and Dharm Bhava are specially for wealth, while Yuvati and Karm Bhava are specially for happiness. Any grah owning Sahaj, Ari, or Labh Bhava will give evil effects.
The effects due to the lords of Vyaya and Randhr Bhava will depend on their association. In each group, the significance will be in the ascending order. Randhr's lord is not auspicious as he owns the 12th from Dharm Bhava. If the lord of Randhr Bhava simultaneously owns Sahaj, Yuvati, or Labh Bhava, he will prove specifically harmful, while his simultaneous ownership of a Kon will bestow auspicious effects. The grah owning a predominant Bhava will stall the effects due to another owning a less significant bhava and will give his own results. Randhr's lordship of Surya and Chandr is not evil.
8-10. Natural Benefics and Natural Malefics: Guru and Shukr are benefics, while Chandr is mediocre in benefice and Buddh is neutral (i.e. a benefic when associated with a benefic and a malefic when related to a malefic). Malefics are Surya, Shani, and Mangal. Full Chandr, Buddh, Guru and Shukr are stronger in the ascending order. Weak Chandr, Surya, Shani, and Mangal are stronger (in malefic disposition) in the ascending order. In revealing maleficence due to rulership of Kendras, Chandr, Buddh, Guru, and Shukr are significant in the ascending order.
11-12. Lordships of Kendras and Konas: If there be an exchange between an lord of a Kendr and a lord of a Kon, or if a lord of a Kendr is yuti with a lord of a Kon in a Kendr or in a Kon, or if a lord of a Kon is in a Kendr or vice versa, or if there happens to be a full drishti between a lord of a Kendr and a lord of a Kon, they cause a Yog. One born in such a Yog will become a king and be famous.
13. If one and the same grah gets the lordships of a Kon as well as a Kendr, or if a grah is in a Kendr or in a Kon, it will prove specially a Yog Karak.
14. Lordship of Kendr: It has been said that a malefic owning a Kendr will become auspicious, which is true only when it simultaneously lords over a Kon and not by merely owning a Kendr.
15. If the lords of a Kendr or a Kon own simultaneously an evil bhava. he (i.e. the lord of the Kendr or the lord of the Kon) does not cause a Raj Yog by mere relations stipulated (as per ch. 34, slokas 11 and 12).
16. Rahu and Ketu: Rahu and Ketu give predominantly the effects as due to their yuti with a bhava lord or as due to the bhava they occupy.
17. If Rahu and Ketu are in Kendr receiving a drishti from or in association with the lord of a Kon, or if Rahu or Ketu happen to be in a Kendr receiving a drishti from or in association with the lord of a Kendr it will become Yog Karak.
18. 0 Maharishi Parashar, please narrate according to the rashis rising as to which grah is a Yog Karak and which is inauspicious.
19-22. Grahas and Mesh Lagn: O Brahmin, listen to these with examples. Even though Mangal is the lord of Randhr Bhava, he will be helpful to (other) auspicious grahas. Shani, Buddh, and Shukr are malefics. Auspicious are Guru and Surya. The mere yuti of Shani with Guru will not produce auspicious effects (although they own a Kon and a Kendr). If Guru is at the disposal of a malefic, he will surely give inauspicious results. Shukr is a direct (or independent) killer. Shani, etc., will also inflict death if associated with an adverse grah (i.e Shukr).
23-24. Grahas and Vrishabh Lagn: Guru, Shukr, and Chandr are malefics. Shani and Surya are auspicious. Shani will cause Raj Yog. Buddh is somewhat inauspicious; the Guru group (Guru, Chandr, and Shukr), and Mangal will inflict death.
25-26. Grahas and Mithun Lagn: Mangal, Guru, and Surya are malefics, while Shukr is the only auspicious grah. The yuti of Guru with Shani is similar to that for Mesh Lagn. Chandr is the prime killer, but it is dependant on her association. 27-28. Grahas and Kark Lagn: Shukr and Buddh are malefics, Mangal, Guru, and Chandr are auspicious. Mangal is capable of conferring a full-fledged Yog and giving auspicious effects. Shani and Surya are killers and give effects according to their associations.
29-30. Grahas and Simh Lagn: Buddh, Shukr, and Shani are malefics. Auspicious effects will be given by Mangal, Guru, and Surya. Guru's yuti with Shukr (though respectively Kon and Kendr lords) will not produce auspicious results. Shani and Chandr are killers who will give effects according to their associations.
31-32. Grahas and Kanya Lagn: Mangal, Guru, and Chandr are malefics, while Buddh and Shukr are auspicious. Shukr's yuti with Buddh will produce Yog. Shukr is a killer as well. Surya's role will depend on his association. 33-34. Grahas and Tula Lagn: Guru, Surya, and Mangal are malefics. Auspicious are Shani and Buddh. Chandr and Buddh will cause Raj Yog. Mangal is a killer. Guru and other malefics will also acquire a disposition to inflict death. Shukr is neutral.
35-36. Grahas and Vrischik Lagn: Shukr, Buddh, and Shani are malefics. Guru and Chandr are auspicious. Surya as well as Chandr are Yog Karakas. Mangal is neutral. Shukr and other malefics acquire the quality of causing death.
37-38. Grahas and Dhanu Lagn: Only Shukr is inauspicious. Mangal and Surya are auspicious. Surya and Buddh are capable of conferring a Yog. Shani is a killer, Guru is neutral. Shukr acquires killing powers.
39-40. Grahas and Makar Lagn: Mangal, Guru, and Chandr are malefics, Shukr and Buddh are auspicious. Shani will not be a killer on his own. Mangal and other malefics will inflict death. Surya is neutral. Only Shukr is capable of causing a superior Yog.
41-42. Grahas and Kumbh Lagn: Guru, Chandr, and Mangal are malefics, while Shukr and Shani are auspicious. Shukr is the only grah that causes Raj Yog. Guru, Surya, and Mangal are killers. Buddh gives meddling effects.
43-44. Grahas and Meen Bhava: Shani, Shukr, Surya, and Buddh are malefics. Mangal and Chandr are auspicious. Mangal and Guru will cause a Yog. Though Mangal is a killer he will not kill the native (independently). Shani and Buddh are killers.
45-46. General: Thus, the auspicious and inauspicious effects derivable through the grahas due to their lordship according to the rising rashi, have to be estimated. Apart, the effects due to Nabhash Yogas, etc., should also be known which I narrate as under.” www.mailerindia.com
These paragraphs are the direct translation of the famous astrology book “Brihat Parashara Hora Shastra”, and has the most relevant study information. I hope you liked it. Please feel free to post your question or comments . Thanks