https://www.codecademy.com/catalog/language/python
https://www.codecademy.com/catalog/language/java
https://www.codecademy.com/catalog/language/cpp
https://www.codecademy.com/catalog/language/javaScript
https://www.youtube.com/watch?v=_v8eksto3ug
https://www.tutorialspoint.com/data_structures_algorithms/data_structure_overview.htm
https://www.codecademy.com/learn/learn-sql
https://www.youtube.com/watch?v=ua-cidnnj30
https://www.youtube.com/playlist?list=plf7l7kg8_fnxhattlwdceyh72qql9pvpq
https://www.youtube.com/watch?v=flzvokscKxy&list=Plqvvvaa0qudf2jswnfigklibinznic4hl
https://www.youtube.com/watch?v=cce8ntxp_xi&list=pltmwhnx-gukkocxqokqokqokqokqokqucxgglsdywssh9
https://www.youtube.com/watch?v=u3ibvu0htns&t=587S (Java)
https://www.youtube.com/watch?v=sny9rta3k_q (java)
https://www.youtube.com/watch?v=t60ynn_zmn8 (java)
https://www.youtube.com/watch?v=dlrxp4ysug4 (Python)
https://www.youtube.com/watch?v=wriunho_6ky (Python)
https://www.youtube.com/playlist?list=pl36ennxu148rzq8zwl8fhgg7ef_-5p3cq (C ++)
https://www.youtube.com/watch?v=pzsegextgae (Python)
https://www.youtube.com/watch?v=xpmthejdyjg (java)
https://www.youtube.com/watch?v=rnvk9natbcm (javaScript)
https://www.youtube.com/watch?v=xdkv5uwek5a (Ethereum에서 자신의 cryptocurrency 코드).
https://www.youtube.com/watch?v=cqgtdkurzte
https://www.youtube.com/watch?v=GXPWCBCB8WC (Python)
https://www.youtube.com/watch?v=fqjdxmu4zaq&list=pl1a2csdiysgipxpszszsziwdavytax61d&index=11&t=0s (Python)
https://www.youtube.com/watch?v=44Adnk7ggka (Java)
https://www.youtube.com/watch?v=xv2xltxnbu&list=Plsm8fkpppppq4scyqpfkxxkao4r1ejpdn (java)
https://www.youtube.com/watch?v=rdxw7ps9vxc&list=plhxz9oqgmqxersk8fuxiumsix0dbqskzs
https://www.youtube.com/watch?v=j3org6cbwuy&list=plqgvjc0mjmzwtyw3oj89tt3fhw19p8twh
https://www.youtube.com/watch?v=fyyarmqiaag&list=PLF797E961509B4EB5 (미적분학 1)
https://www.youtube.com/watch?v=h9ect6f_ftw&list=pldesaqwtn6eq2j4vgsn1hyberadeh4cw- (Calculus 2)
https://www.youtube.com/watch?v=TGVNBAHLAPA&list=PLDESAQWTN6ESK16YRMZUJ8F6-RNUY0RY7 (CAMPULUS 3)
https://www.youtube.com/watch?v=ygjjywecqs8&list=pldddgpdw7e6ajacaee9awozsaoou-nix_
https://www.youtube.com/watch?v=xf-3atzfyka&list=pldesaqwtn6espahy2qukvaxnzuqnxkyq_
https://www.youtube.com/watch?v=pxicas22mtq&list=plq_gufxankl8bjqh-hgq9u24xzp9x0dx
https://www.youtube.com/watch?v=9FTHB7V14FO&list=PL5102DFDC6790F3D0
https://www.youtube.com/watch?v=yzr5qglx_9m&list=plai3u8-wik0h-1b5skihgapsh223l7xrt
https://www.youtube.com/watch?v=pzri1ifsty0&list=Pl-xeha0tmq2w0vlojmjfkbtuarmhfzbqv
https://www.youtube.com/watch?v=gp21wu6r0-o&list=plslgishee5tbm8utct1f66kpmjcblzkt
https://www.youtube.com/watch?v=4S3KS-ynufc&list=Plbmvogvj5njt8itaur8fowbujy0vs-z3c
https://www.youtube.com/watch?v=qgizzltvxxs&list=plrmhiyyair3gngcvq3r1oe3azqlf8iqvg
https://www.youtube.com/watch?v=urefkmseuai&list=Ple125425ec837021f
https://www.youtube.com/watch?v=nqphpiser30&list=pliy8endw5tw-yjhsxapeilnjx2dkll-ox
https://www.youtube.com/watch?v=6G4O5UOH304 (Python)
https://www.youtube.com/watch?v=eoyfa6myog4 (js)
https://www.youtube.com/watch?v=J3MZ0BRQ0QE (Java)
https://www.youtube.com/watch?v=ljuf1myqaie (java)
https://www.youtube.com/watch?v=qut1vhilmmi (Python)
https://www.youtube.com/watch?v=rvmvqpsxl10 (Python)
https://www.youtube.com/watch?v=cnui8owsppg (Python)
https://www.youtube.com/watch?v=iqfg0fadrze (Python)
https://www.youtube.com/watch?v=voxk7kp4crc (java)
https://www.youtube.com/watch?v=0LT9W-BXKFQ (Python)
https://www.youtube.com/watch?v=qfxx4-9rb7U&list=Plpl9qxtm4nihk5-cc6egbj3gqthoa6os0nv (java)
https://www.youtube.com/watch?v=zn8djhgsi84 (Python)
https://www.youtube.com/watch?v=rznkvrtfkby&list=plzbbt5o_s2xrwrnxk_ycptnqqo4_u2ygl (python)
https://www.youtube.com/watch?v=OF-Q92CD850 (R)
https://www.youtube.com/watch?v=r4-ynxw0x5w&list=plkevnnrk8uvmvkrdgznk3o3lxmjfraw7s
https://www.youtube.com/watch?v=5xdhnppybv4 (Python)
https://www.youtube.com/watch?v=y0VHB4YFVWS (Java)