Found twenty-one times in the New Testament, the Greek noun “didaskalia” meant “instruction” or “teaching.”  There are the religious “doctrines” of men which condemn (Mt. 15:9Mt. 15:9
English: American Standard Version (1901) - ASV
9 But in vain do they worship me, Teaching as their doctrines the precepts of men.

WP-Bible plugin; Mk. 7:7Mk. 7:7
English: American Standard Version (1901) - ASV
7 But in vain do they worship me, Teaching as their doctrines the precepts of men.

WP-Bible plugin).  The Old Testament is for our “learning” (Rom. 15:4Rom. 15:4
English: American Standard Version (1901) - ASV
4 For whatsoever things were written aforetime were written for our learning, that through patience and through comfort of the scriptures we might have hope.

WP-Bible plugin).  People may be carried about by every wind of “doctrine” (Eph. 4:14Eph. 4:14
English: American Standard Version (1901) - ASV
14 that we may be no longer children, tossed to and fro and carried about with every wind of doctrine, by the sleight of men, in craftiness, after the wiles of error;

WP-Bible plugin).  Some teaching is contrary to sound “doctrine” (1 Tim. 1:101 Tim. 1:10
English: American Standard Version (1901) - ASV
10 for fornicators, for abusers of themselves with men, for menstealers, for liars, for false swearers, and if there be any other thing contrary to the sound doctrine;

WP-Bible plugin).  There are the “doctrines” of devils (1 Tim. 4:11 Tim. 4:1
English: American Standard Version (1901) - ASV
4 ¹ But the Spirit saith expressly, that in later times some shall fall away from the faith, giving heed to seducing spirits and doctrines of demons,

WP-Bible plugin) as well as “good doctrine” (1 Tim. 4:61 Tim. 4:6
English: American Standard Version (1901) - ASV
6 If thou put the brethren in mind of these things, thou shalt be a good minister of Christ Jesus, nourished in the words of the faith, and of the good doctrine which thou hast followed until now:

WP-Bible plugin).  Heed is to be given to “doctrine” (1 Tim. 4:11 Tim. 4:1
English: American Standard Version (1901) - ASV
4 ¹ But the Spirit saith expressly, that in later times some shall fall away from the faith, giving heed to seducing spirits and doctrines of demons,

WP-Bible plugin3, 16).  It is possible to “labor in doctrine” (1 Tim. 5:171 Tim. 5:17
English: American Standard Version (1901) - ASV
17 Let the elders that rule well be counted worthy of double honor, especially those who labor in the word and in teaching.

WP-Bible plugin).  There is the “doctrine” according to godliness (1 Tim. 6:31 Tim. 6:3
English: American Standard Version (1901) - ASV
3 If any man teacheth a different doctrine, and consenteth not to sound words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness;

WP-Bible plugin).  We read of “sound doctrine” in Tit. 1:9; 2:1Tit. 1:9; 2:1
English: American Standard Version (1901) - ASV
9 holding to the faithful word which is according to the teaching, that he may be able to exhort in the sound doctrine, and to convict the gainsayers. ^{2 1} But speak thou the things which befit the sound doctrine:

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