my first week doing sudoku. did fine till my 1st hard puzzle. got this far, how do i proceed. i am totally unfamiliar with any of the lingo about solving, except for pencilmarks. thanks for your patience and help.
--- 4-- 5-8
--- 9-8 --7
-86 5-- ---
-9- 645 --3
125 837 6--
463 192 785
--- 2-- 35-
23- 754 ---
--1 3-9 -7-