I'll keep this post Short because I know you are already exhausted browsing all Tips and Stuff that you can find on youtube or google etc... To Start your Freelancing Career , Minimum Required Skills to learn is

1. HTML

   The HyperText Markup Language, or HTML is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript.

2. CSS

   Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language such as HTML.[1] CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.

3. Wordpress

   WordPress (WP, WordPress.org) is a free and open-source content management system (CMS) written in PHP[4] and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system, referred to within WordPress as Themes.

That's it to Get Started . I can't promise that you will get $1000 per month If you learn these Skills , but to get Started , these Skills are More than Enough.

Some additional Skills are

1. SEO

   - (Search Engine Optimization) Search engine optimization (SEO) is the process of improving the quality and quantity of website traffic to a website or a web page from search engines.[1] SEO targets unpaid traffic (known as natural or organic resolts) rather than direct traffic or paid traffic. Unpaid traffic may originate from different kinds of searches, including image search, video search, academic search,[2] news search, and industry-specific vertical search engines.

2. Adwords

   Google Ads (formerly Google AdWords) is an online advertising platform developed by Google, where advertisers bid to display brief advertisements, service offerings, product listings, or videos to web users.[3] It can place ads both in the resolts of search engines like Google Search (the Google Search Network) and on non-search websites, mobile apps, and videos (the Google Display Network).[4][5] Services are offered under a pay-per-click (PPC) pricing model.

3. Social Media Ads

   Social media advertising is a category of digital advertising that places ads on social networking sites. It has one of three purposes: branding, response or both. ... With paid social advertising, the marketer is trying to reach new audiences that he or she can't reach with organic efforts.

4. Web Design/Mobile Design

   Web design encompasses many different skills and disciplines in the production and maintenance of websites. The different areas of web design include web graphic design; user interface design; authoring, including standardised code and proprietary software; user experience design; and search engine optimization. Whereas , Web design encompasses many different skills and disciplines in the production and maintenance of websites. The different areas of web design include web graphic design; user interface design; authoring, including standardised code and proprietary software; user experience design; and search engine optimization.

5. UX+UI

   The “UI” in UI design stands for “user interface.” The user interface is the graphical layout of an application. It consists of the buttons users click on, the text they read, the images, sliders, text entry fields, and all the rest of the items the user interacts with. Whereas , “UX” stands for “user experience.” A user’s experience of the app is determined by how they interact with it. Is the experience smooth and intuitive or clunky and confusing? Does navigating the app feel logical or does it feel arbitrary? Does interacting with the app give people the sense that they’re efficiently accomplishing the tasks they set out to achieve or does it feel like a struggle?

Some advanced Skills are

1. Niching Down

   Niching down means having a clear focus on who your ideal target customer is and aligning your marketing to match. But there is confusion here, even amongst the 'experts'. Focusing on a niche is not an end in itself, it must form part of an overarching marketing strategy.

2. Negotiation

   Negotiation is a dialogue between two or more people or parties intended to reach a beneficial outcome over one or more issues where a conflict exists with respect to at least one of these issues.

3. Outsourcing

   Outsourcing is an agreement in which one company hires another company to be responsible for a planned or existing activity that is or coold be done internally, and sometimes involves transferring employees and assets from one firm to another.

4. Automation

   Automation describes a wide range of technologies that reduce human intervention in processes. Human intervention is reduced by predetermining decision criteria, subprocess relationships, and related actions — and embodying those predeterminations in machines.

5. Scaling

Where to Learn these skills ??

1. Courses at Udemy.com

2. Read Blogs and Documentation

3. Watch Youtube Videos + Tutorials