There are two kinds of dageshim: more here or this video
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dagesh lene video
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dagesh forte video
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| A dagesh lene makes the pronunciation of a BGDKFT letter hard; e.g. a ב is pronounced “v”. A בּ is pronounced “b”. | A dagesh forte doubles the pronunciation of a letter. |
| Only occurs in BGDKFT letters. | Never occurs in a guttural. |
| Never preceded by a full vowel. | Always preceded by a full vowel. |
Note #2: the dagesh in a vav-conversive will never appear in the first letter of the verb root.