Keywords are the base of any SEO campaign and placing your keywords appropriately not an is not easy task. Here you can find some points about where to add keywords and keyword phrases which may help you;

1.Add Keywords in title tag: title is the best place to add your targeted keywords. The text written inside the title tag displays in search results as your page title. It should be be short and limited to 6-7 words in it. It will be better to add targeted keyword in the beginning of title tag.

2.Add Keywords in URL: Adding your keywords in website URL is also a good idea. For example http://www.mysite/seo-services where “seo-services” has been used as keyword phrase. Inclusion of keywords in URL may help you from SEO point of view. It is recommended to use hyphen (-) instead of underscore (_) in URLs as separator.

3.Add Keywords in heading tags: Adding keywords in heading tags like H1, H2 and H3 is as beneficial as putting them in page title. Do not use words like: and, for, the, or etc. as they are ignored by search engine spiders. Try to make best possible use of this place.

4.Add Keywords in meta tags: Meta tags are not so important as earlier. Major search engine like google do not consider it but still it is valuable for other search engines like yahoo, msn. So if you are optimizing for yahoo and msn then add your keywords properly.

5.Add Keywords in Alt tags: Search engine spiders are unable to read images or graphics. If you have images in your web page then make sure to include main keyword(s) in the ALT tags, but never over do it as your ranking could be dropped in the result.

6.Add Keywords in anchor text: Anchor text is really an important place to add keywords. Do not create simple internal link with anchor text like “Click Here” or "visit this link" instead of this you can use your keywords relevant to the page. It becomes more important in case of inbound links as it will be regarded as a vote from another site for a particular keyword to your site.

Good standard points but to add something else is to actually use the keywords in the body of the websites.

Yes, indeed, proper keywords placement and density play vital role in SEO. You have mentioned some important points; here are some other factors to consider as well...
•Try to use keywords in SEO friendly navigation
•Use best suitable keywords in every page of your website, but avoid Spamdexing. Your pages must be for visitors; not for search engine

All of you have some great tips on keywords and key phrases.  I'd like to add one more  most people don't think of and doesn't  applied everyone. I call it misspelling a word. To give you an example like my site.  The word San Francisco is to words surprisingly  enough a lot of people will type in San Francisco as one word  SanFrancisco. 
There a lot of words like this.  So I use both of them in the text in my site. What I've found  is that   people type San Francisco spelled both ways in Google and  Google will give you a different page for each spelling.  When I analyze my keywords and key phrases I've found people are finding me both ways. I also track my keywords and key phrases to see which ones I'm getting the most traffic from. I'll test different keywords from time to time. After all it is traffic were looking for.

I also found that using the "bold"/"strong" coding also helps the keyword especially in text!

Definitely Yes! Along with Bold & Strong keyword text styles, if you use Italic Tag with [em] (that emphasizes a text and search engine gives it priority over normal text), then it will also be helpful for SEO purposes.

by the time using  key words remember that keyword stuffing is not allowed in white hat seo
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I heard too much about Alt Tags in photos but till date did not get a clear idea about this. Will you guys please help me and tell me in details.

Please do not tell me google it as I am not so expery by reading only. I do not have any certificate or I am not any kind of programmer.

So please tell me about Alt Tahs in photos.

Well just right click on any images and select property button. At the last you will see Alternate Text and this one is Alt Tags. When you upload any photo go to html format and see that photos description. At there you will find Alt "". So in this between two commas just write your photos name and it should be related with your news and photos as well.