For example there are some sample keywords. how to make money online, make money online free, ways to make money online, make money online fast, best way to make money online, make money online without investment Is it batter to use simple sentence with all common words like following. "how to make money online free ways fast best way without investment" In this way, google can make many combination of keywords. It also takes small space and quick approach.
I don't think it's a good idea because then, your sentence will not make any sense, as you can see in the example you have. What you can do is take one long tail keyword like "best way to make money online" and optimize your page/post with that phrase. Your page/post will both be grammatically correct and optimized for that particular keyword.
As in whatever sentence you use keyword , it should be look as it is just the one word part of the whole sentence. But do not make whole sentence with keywords. As it will be negative impact for your site.
I hope you are not targeting each and every keyword on a single page so rather than including more and more keywords in just one sentence (that doesn't make much of sense) it would be better you target them on different pages and have meaningful, relevant Title for each page. If you are targeting them on one single page then sort out your keywords as per Competition. Then write your title using 2-3 primary keywords. Use other words in your description, content, heading tags and in back-links.
but my dear, effectiveness of keyword hugely depends on their placement. 1. initial words are more relevant so you will have a good chance on how to make money online than make money without investment 2. phrases stick together simultaneously are also more relevant than words spreading all over the sentence.
I am wondering whether using the keyword "house for sale florida" will actually improve better then using the keyword "house for sale in florida" with the (IN) word between.... Can somebody advise on the following: 1. Will both actually give the same result ? in other words, does it matter using the "IN" word ? or not. 2. Would you recommend using the IN word or without ? 3. Will google penalize if using both just to be sure ?
Keywords in sentence form is good but if you use too long sentence it will have less credibility for last words that is what count sin SEO
Your keywords does not make any sense, try to use page specific keywords and divide your keywords according to relevancy of page.
The way you wrote the sentence in called keyword stuffing. Search Engines are smart enough to detect when you are not writing naturally and may de-rank your content if you follow this strategy extensively.