You want to use keywords in the title, in the first 250 words of content, make it natural thought not just a keyword repeating multiple times. Also make it readable synonms of keywords aren't a bad idea either.
Also in the meta keywords and description although for a blog the content for an entry will get used at the description
For image ALT tags try to use keywords your targeting but keep it short and descriptive if your stuffing to much it looks like spam to the engines and will be ignored anyway
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