There are some good harmonica forums on the internet. Most will be about the diatonic 10 hole harmonica.
Slidemeister is one of the best harmonica forums.
Or this one:
https://www.modernbluesharmonica.com/blues_harp_forum.html
Check out the patmissin harmonica website, packed with info and docs about harmonica
https://www.patmissin.com/ffaq/HarmonicaPhonetics.pdf
If you have been given a Chinese tremolo harmonica, you are rather limited in music genres.
In my collection there is a Hohner Echo tremolo harmonica, and a double sided Hohner Echo tremolo harp.
I never play these, because the high notes dont sound, the tremolo sound at the top register sounds horrible. Only in the low register do I like the Wiener tremolo sound of a harmonica.
My simple advice would be to get a plastic comb 10 hole Hohner Special 20 or something like that.
You will have a much easier learning curve, and you can do soooooo much more with a blues harmonica !
Cheap leaky harmonicas are the worst. If you spend some more money, to get an airtight harmonica, harmonica is all fun, and you can go on for hours without fatigue.
(the same is true with accordions. They have to be airtight. I once tried to play a leaky accordion. Those bellows changes ! And almost no sound coming from the reeds !)
Tomlin Leckie is a real expert, and he is right about plastic comb harmonicas for starters.
(He says he prefers wood combs himself, but correctly says that wooden combs can drink up a lot of saliva, if the comb is not perfectly sealed. And then your tongue has got to wet your lips very often. With a plastic comb the moisture stays on the comb much longer. Every harmonica player hates to burn his dry lips in fast moves around the comb)
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With a tremolo Wiener harmonica, the holes are so small, you cant bend the notes.
Chromatic harmonicas with a slide stick are not so airtight as blues harmonicas. Because there is a minimal spacing between the slide and the holes.
And the air can go in between the slide and the airholes.
(Something similar is true for accordions. I have eg a 60 bass CBA accordion, tremolo sound MM, without register buttons or slides. This little accordion is very loud ! Because 100% of the air pressure goes to the reeds. No leaks.)