Good morning, people. I am new in Salesforce - I am currently taking the Sales and CRM professional Certificate and would appreciate if you guys could give me some tips.

Welcome to the ecosystem, Luan. A few tips that help most people coming through a sales and CRM certificate: 

1) Practise in a real org, not just videos. Sign up for a free Developer Edition or use your Trailhead Playground, and rebuild what each lesson covers: create leads, convert them, move opportunities through stages, and build a simple report and dashboard. 

2) Pair the course with Trailhead. The Admin Beginner trail and the Sales Cloud modules use the same objects you will see in the certificate, and the hands-on challenges check your work automatically. 

3) Learn the data model early. Understanding how Leads, Accounts, Contacts and Opportunities relate makes reports, automation and later certifications much easier. 

4) Pick a next certification. Many people go to Salesforce Certified Associate first and then Administrator. The official exam guides list the exact topics and weightings, so study against those. 

5) Build one small portfolio project, for example a simple sales pipeline with a validation rule, a Flow and a dashboard, and write down what you built. It is useful in interviews. 

Good luck!