What is the authenticity of the hadiths concerning the merit of seeking knowledge, and does the word "knowledge" mentioned therein include every beneficial branch of knowledge?

The Hadith: "A gathering of fiqh (understanding of Islamic law) is better than sixty years of worship" was narrated by Al-Daylami and is weak. Authentic and good Hadiths, however, mention the virtue of seeking knowledge, such as: "Whoever goes out seeking knowledge is in the path of Allah until he returns," and "The superiority of the scholar over the worshipper is like my superiority over the least of you." As for the Hadith: "One faqih (jurist) is tougher on Satan than a thousand worshippers," it is weak. The Hadiths: "The best worship is fiqh," "Both gatherings lead to good," and "A little fiqh is better than a lot of worship" are very weak. Likewise, the saying of Abu Dharr and Abu Hurayrah regarding the virtue of learning one chapter being better than a thousand supererogatory rak'ahs is weak. As for the saying of Abu Darda: "An hour of discussing knowledge is better than a night of prayer," it was not reported with this exact wording, but it was reported from him: "An hour of contemplation is better than a night of prayer," and its chain of narration is gharib (uncommon) but sound. It is authentically reported from the Prophet, peace and blessings be upon him: "Standing for an hour in the path of Allah is better than praying the Night of Decree (Laylat al-Qadr) at the Black Stone." The knowledge intended in the Hadiths and the sayings of the predecessors (Salaf) is the knowledge of the Shari'ah (Islamic law), and worldly sciences are rewarded for their possessor if he learns them to serve himself and his nation.