As an online marketing consultant, what is the best advice you can give to product managers or entrepreneurs?

The answer may not be 'one size fits all' but yet after generalization, the correct answer would be to do the following. 1) Cover the basics: Website with latest tech, Google compliance, Search- friendly, loads of back links, Social media presence, creating interesting contents, get experts/opinion makers to talk about your brand etc. 2) Once basics are covered then we can go for Re-marketing, video blogging, Landing page creating, using online tools or hiring an external agency for further advancement. 3) Last but least, for an entrepreneur it is very important to be aware of what's going on, what are the latest trends, what is fading away, what are the best practices being adopted by the category leaders (and how that can be tailor fitted to his brand) etc. Because the market and consumer will move on with the latest tech and trends, whether brands ready to do that or not.

To be a successful online marketer you need a laser-like focus on a narrow target market, sometimes called a niche.

produce market oriented product, assess customer satisfaction, use different promotion tools etc

"Build a product/service which is better efficient than existing alternatives."

You don't need a marketing person on board then!

As a product managers or entrepreneurs first they have to understand the opportunity available in the digital space to market their product. Definate mrketing goal is to what they want to get as a return is matter a lot. Which might be any of the following,

1. Sales
2. Brand Builing
3. Engagment 
4. Brand + Lead.

According to above Goal they has to plan the digital platform which serves their strategy. (Choose the right flatform to be successfull in online media).

And it is also very importent that you have to think as customer perspective when online marketing is concerned. 

from my opinion If you're looking for creative and effective marketing strategies to increase the flow of traffic to your site and therefore your sales, use these 10 previous techniques of e-marketing techniques to grow your business. Start using some of these strategies today, and increase your sales immediately.

The best advice is to be fully aware and familiar with exact customers needs, the best products mix that satisfy the customers' needs,  your market's competitors, and the latest development or innovations in the industry. AND APPLY CCC FOR THE ANY PRODUCT. 1ST "C" IS CONFIDENT FOR THE PRODUCT.2ND "C" IS COMUNICATION AND 3RD "C" CONFUTION 

As a consultant i would say, try to be patient on achieving success because a lot of entrepreneurs with young ideas give up at their start-up because they loose confidence due to market statistics so its very important to have believe that industry is filled with perseverance. 

As an entrepreneur and start-up founder is to build a product that solves a problem, finds a way to monetize it, drives revenue and hires the right team to keep growth steady, right?  You are not expected to stay up to date on everything that is happening in the digital marketing industry vertical.  But you can not be so naive to think that you don’t need to know anything.  

Thanks for invitation,

The best advice is to be fully aware and familiar with exact customers needs, the best products mix that satisfy the customers' needs,  your market's competitors, and the latest development or innovations in the industry.

Should have strong knowledge about the product and have great writing skills.