Most of the sound symbols (letters) should be familiar. The others are probably familiar, you just don't recognize them yet.
"`" is the stress mark. It follows a vowel and slightly raises the tone of the vowel and gives more emphasis to the vowel than the other letters.
"_" is the nasal tone mark. It puts an "n" sound to the vowel and is produced through the nose, however the "n" itself is never said. It is the "n" sound at the end of "Jen".
"'" is the glottal stop. This ends the sound/air flow for a moment. It is the breathless pause between "tick tock"
"tc" is the "ch" sound in "witch"